Start by opening the cheat menu and typing give_trait "Charactername" Traitname Traitlevel for instance give trait "Cecelia" LaxPersonalSecurity 2 and so on.
The trait list's shows the trait name, maximum level for each trait and attribute changes for the maximum level of that trait. Play about with the level some act differently at different levels for instance "Drink 1" is a bonus wheres "Drink 6" is a huge disadvantage.

General Traits
-GoodCommander 5 +5 Command
-BadCommander 4 -5 Command
-GoodAttakcer 5 +5 Command when attacking
-BadAttacker 4 -4 Command when attacking
-GoodDefender 5 +5 Command when defending
-BadDefender 4 -4 Command when defending
-Drink 6 -5 Command, -5 Authority, TaxCollection -10
-Feck 4 -4 Chivalry, -6 Piety, -2 Loyalty, -2 Authority, Troop Morale +4
-Ar se 4 -3 Command, -5 Authority
-Girls 5 -2 Chivalry, LocalPopularity -3
-Sobriety 3 +1 Command, -2 TroopMorale, Personal Security +2, LocalPopularity -2
-GoodAmbusher 4 +4 Command When Ambushing
-BadAmbusher 3 -3 Command when ambushing
-Disciplinarian 3 +1 Command, +1 Authority, -2 Troop Morale, +4 MovementPoints, +1 Law
-BadDisciplanarian 3 -1 Command, -1 Authority, +3 Troop Morale, -4 Movement Points, -1 Law
-GoodSiegeAttacker 4 +4 Command when assaulting settlement
-BadSiegeAttacker 3 -3 Command when assaulting settlement
-GoodSeigeDefender 4 +4 Command when defender from beseigers
-BadSeigeDefender 3 -3 Command when defending from besiegers
-Brave 5 +2 Authority, +2 Troop MOrale
-Coward 4 -4 Troop Morale
-Slothful 4 -2 Authority, -4 Movement Points, -15 Tax Collection
-Energetic 4 +2 Authority, MovementPoints +5
-Beserker 3 -4 Chivalry, Troop Morale +3, Attack +3
-Xenophobia 3 +3 Public Security
-Xenophilia 3 -3 PublicSecurity
-PublicAtheism 4 -8 Piety, +8 Unrest
-PublicFaith 3 +4 Piety
-GoodAdministrator 3 +3 Law, +10 Trading
-BadAdministrator 3 -10 Trading
-InspiringSpeaker 3 +2 Law
-BoringSpeaker 3 -2 Authority, -2 Troop Morale
-RhetoricSkill 2 +2 Authority
-StrategicSkill 3 +3 Command
-TacticalSkill 3 +4 Command When Ambushing, +3 Line of Sight
-MathematicalSkill 3 +3 Command when Beseiging, +30 seige equipment points, +15 Trading
-PoliticsSkill 3 -2 Loyalty, +2 Authority
-LogisticalSkill 3 +3 Morale, +4 MovementPoints
-RabbleRouser 4 +2 Authority, +4 LocalPopularity, +2 Unrest
-VictorVirtue 3 +3 Authority, -2 PersonalSecurity, +3 Local Popularity
-Epicurean 3 +10 Trading, -3 BribeResistance
-Stoic 3 +2 Loyalty, BribeResistance +30
-Austere 3 +2 Loyalty, +30 Bribe Resistance, +10 Tax Collection
-Aesthetic 3 -3 Command, BribeResistance -2, Squalor -2
-Ignorance 3 -2 Authority, -10 Trading, TaxCollection -10
-Gambling 4 -20 Trading, BribeResistance -4
-SpyMaster 3 -1 Chivalry, PublicSecurity +2, Training Agent Cost Reduced
-AssassinMaster 3 -3 Chivalry, +2 Personal Security, Reduces Assassin Recruitment cost
-CounterSpy 3 +1 Chivalry, +1 LineofSight, +4 PublicSecurity
-AssassinCatcher 3 +2 Chivalry, +1 LineofSight, PersonalSecurity +4
-Trusting 3 -3 PersonalSecurity
-Paranoia 4 -2 Command, -2 Authority, +4 PersonalSecurity
-Liar 3 -3 Authority
-Embezzler 3 -30 Tax Collection
-DeceiverVirtue 3 -3 Loyalty, +3 authority
-Upright 3 +3 Loyalty, +30 BribeResistance, +6 Law
-Corrupt 3 -2 Loyalty, -4 BribeResistance, -30 TaxCollection, -3 Law
-Authoritarian 3 +2 Authority, +3 Unrest, +6 Law
-NonAuthoritarian 3 -2 Authority, -6 Unrest, -3 Law
-Disloyal 4 -3 Chivalry, -4 Loyalty
-Loyal 4 +3 Chivalry, +4 Loyalty
-Cuckold 4 -4 Authority
-GoodFarmer 3 +3 Farming Income
-GoodMiner 3 +3 Mining Income
-GoodEngineer 3 +2 Seige Attack, +60 Seige Build Pts
-BadEngineer 3 -3 Seige Attack
-GoodTrader 3 +30 Trade
-BadTrader 3 -30 Trade
-Just 3 +3 Chivalry, +3 Law
-Unjust 3 -3 Chivalry, +3 Unrest
-HarshJustice 3 -1 Chivalry, +3 Unrest, +6 Law
-LenientJustice 3 +1 Chivalry, -3 Law
-HarshRuler 3 -3 Chivalry, -2 PersonalSecurity, +2 Squalor, +3 Law
-KindRuler 3 +3 Chivalry, Squalor -3
-GoodBuilder 3 +15 Construction, -3 Squalor
-BadBuilder 3 -15 Costruction, +3 Squalor
-Generous 3 -5 Trading, -10 Tax Income
-Miserly 3 +5 Trade Income, +10 Tax Income, +3 Squalor
-Noctophobia 3 -3 Command at Night, +2 PersonalSecurity
-Noctophilia 3 + 3 Command at Night
-Perverted 6 -4 Piety, -2 Authority, -5 LocalPopularity
-Scout 3 +3 Line of Sight
-BattleScarred 4 +2 Authority, +8 HitPoints
-GoodInfantryGeneral 3 +3 Command when commanding Infantry
-BadInfantryGeneral 3 -3 Command when commanding Infantry
-GoodCavalryGeneral 3 +3 Command when Commanding Cavalry
-BadCavalryGeneral 3 -3 Command when Commanding Cavalry
-Fearsaztec 3 -3 COmmand v aztec
-Hatesaztec 3 +3 command v aztec
-Fearsbyzantium 3 -3 command v byzantium
-Hatesbyzantium 3 +3 Command v byzanitum
-Fearsdenmark 3 -3 command v denmark
-Hatesdenmark 3 +3 command v denmark
-Fearsegypt 3 -3 command v egypt
-Hatesegypt 3 +3 Command v egypt
-Fearsengland 3 -3 command v england
-Hatesengland 3 +3 command v england
-Fearsfrance 3 -3 command v france
-HatesFrance 3 +3 command v france
-Fearshre 3 -3 command v holy roman empire
-Hateshre 3 +3 command v holy roman empire
-Fearshungary 3 -3 command v hungary
-Hateshungary 3 +3 command v hungary
-Fearsmilan 3 -3 command v milan
-Hatesmilan 3 +3 command v milan
-Fearsmongols 3 -3 command v mongols
-Hatesmongols 3 +3 command v mongols
-Fearsmoors 3 -3 command v moors
-Hatesmongols 3 +3 command v moors
-Fearspapal_states 3 -3 command v papal states
-Hatespapal_states 3 +3 command v papal states
-Fearspoland 3 -3 command v poland
-Hatespoland 3 +3 command v poland
-Fearportugal 3 -3 command v portugal
-Hatesportugal 3 +3 command v portugal
-Fearsslave 3 -3 command v rebels/brigands
-Hatesslave 3 +3 command v rebels/brigands
-Fearsrussia 3 -3 command v russia
-hatesrussia 3 +3 command v russia
-Fearsscotland 3 -3 command v scotland
-Hatesscotland 3 +3 command v scotland
-Fearssicily 3 -3 command v sicily
-Hatessicily 3 +3 command v sicily
-Fearsspain 3 -3 command v spain
-Hatesspain 3 +3 command v spain
-Fearstimurids 3 -3 command v timurids
-Hatestimurids 3 +3 command v timurids
-Fearsturks 3 -3 command v turks
-Hatesturks 3 +3 command v turks
-Fearsvenice 3 -3 command v venice
-Hatesvenice 3 +3 command v Venice
-Fearscatholic 3 -3 command v catholic factions
-Hatescatholic 3 +3 command v catholic factions
-Fearsorthodox 3 -3 command v orthodox factions
-Hatesorthodox 3 +3 command v orthodox factions
-Fearsislam 3 -3 command v islamic factions
-Hatesislam 3 +3 command v islam factions
-Hatesheretic 3 -1 troop morale
-Fearspagan 3 -3 command v pagans
-Hatespagan 3 +3 command v pagans
-Inbred 6 -3 command, - 3 authority, -15 tax collection, - 2 fertility
-Handsome 4 -1 command, +1 Authority, +4 popularity
-Ugly 5 -5 popularity, -3 fertility
-Fertile 3 increases chance of having children
-Infertile 3 decreases chance of having children
-GoodTaxman 3 +30 tax income, +2 Unrest
-BadTaxman 3 -30 Tax Income
-GoodRiskyAttacker 3 +1 troop morale, +3 attack command
-BadRiskyAttacker 3 -1 troop morale, -3 attack command
-GoodRiskyDefender 3 +1 troop morale, +3 command when defending
-BadRiskyDefender 3 -3 command when defending
-Superstitious 3 -2 Piety, -1 Authority, -2 Troop Morale
-Pragmatic 3 +3 Authority, +2 TroopMorale
-ExpensiveTastes 3 Increased construction cost, - 30 tax income, -2 squalor
-Cheapskate 3 decreased construction cost, +15 tax income, +3 squalor
-Hypochndriac 3 -2 troop morale, -2 command, - 6 hitpts
-HaleAndHearty 3 increases chance of having children, +6 hp
-TouchedByTheGods 3 +4 piety
-Insane 3 -4 AUthority, -3 Morale
-Deranged 3 -3 command, -3 Authority, Troop Morale -2, -10 Trade Income, -5 Tax Income
-Bloodthirsty 3 -3 Chivalry, -1 Command, -3 Morale
-Haemophobic 3 -3 Authority, -3 Troop Morale
-Anger 3 -2 Chivalry, +2 Command, -2 Troop Morale
-Lewd 3 -3 Authority, -5 BribeResistance
-Prim 3 -1 command, +2 Authority, +4 Bribe Resistance, -1 Squalor, +3 Unrest, +3 Law
-IndecisiveAttacker 3 -3 command when attacking
-Intelligent 3 +3 Command, +10 Trade Income, +10 Tax Income
-Despoiler 3 30% more loot
-Genocide 3 -3 chivalry, +30% more loot
-NaturalMilitarySkill 4 +4 Command
-Factionleader 1 +1 Command, +2 Authority, +3 Personal Security
-Factionheir 1 +1 Command, +1 Authority, +2 PersonalSecurity
-Exheir 1 -3 Loyalty

-NightBattleCapable 1 allows character to conduct night battles
-LoyaltyStarter 1 +5 Loyalty
-ForcedReligious 3 +3 Piety, -1 Morale
-CrusaderHistory 3 +3 Chivalry, +3 Piety, +3command v islamic factions
-JihadHistory 3 +3 Chivalry, +3 Piety, +3 command v catholic factions
-AdoredByPope 3 +3 Piety, +3 command v islamic factions
-PopesEnforcer 2 +2 Chivalry, +2 Command v islamic factions
-BattleDread 5 -5 chivalry, +2 Authority
-BattleChivalry 5 +5 Chivalry, +2 Authority
-StrategyDread 5 -5 Chivalry, +3 Authority
-StrategyChivalry 5 +5 Chivalry, +3 Authority
-CaptorDread 4 -4 Chivalry
-CaptorChivalry 4 +4 Chivalry
-RansomChivalry 4 +4 Chivalry, +3 Morale
-RansomDread 4 -4 chivalry, -3 Morale
-GoodArtilleryCommander 4 +4 command with artillery
-BadArtilleryCommaner 3 -3 command with artillery
-GoodGunPowderCommander 4 +4 command when commanding gunpowder units
-BadGunPowderCommander 3 -3 Command with gunpowder units
-Cursed 4 -3 Piety, -4 Command, -2 Authority, -4 TroopMorale
-StrickenSilly 3 -1 Piety, -3 Command, -2 Authority, - 3 TroopMorale
-StrickenSerious 3 -1 Piety, -3 Command, -1 Authority, -3 TroopMorale
-Gregarious 3 +2 TroopMorale, +3 Popularity
-Introvert 3 -2 TroopMorale, -3 Popularity
-ExRebel 3 -3 Loyalty
-ContentGeneral 3 +5 Loyalty
-DiscontentGeneral 3 -5 Loyalty
-EasternWarlord 3 -3 Chivalry, +6 Command
-JaguarWarlord 3 -3 Chivalry, +6 Command
-WifeIsCharming 3 +2 Popularity, Increases chance to have children
-WifeIsHorrid 3 -2 Popularity, decreases chance to have children
-WifeIsFertile 3 increases chance to have children
-WifeIsBarren 3 decreases chance to have children
-WifeIsWise 3 +15 Trade Income, +15 Tax Income
-WifeIsNoble 3 +1 Personal Security, +3 Popularity
-WifeIs***** 3 -1 Public Security, -3 LocalPopularity
-FactionKiller 4 +4 Authority
-GoodDiplomacy 4 +4 Authority
-BadDiplmoacy 3 -3 Authority
-FathersLegacy 3 +3 Authority
-ChivalryLegacy 2 +2 Chivalry
-DreadLegacy 2 -2 Chivalry
-TourneyKnight 5 +3 Chivalry, +2 Authority, +2 CavalryCommand
-HorseRacer 3 +1 Authority, +2 Movement Points, +1 CavalryCommand
-ReligiousActivity 4 +2 Chivalry, +4 Piety
-ReligiousInactivity 2 -2 Piety
-MarriedAPrincess 1 +3 Loyalty
-GloriousFool 3 -3 Command, +6 TroopMorale
-TooOldToFight 1
-Senile 3 -6 Command, -3 Authority
-Cultured 2 +1 Authority, +2 Popularity

-PretentiosWoman 2 -2 charm
-HumbleWoman 2 +2 Charm
-PrettyWoman 3 +3 Charm
-UglyWoman 2 -2 charm, decreases chance to have children
-BraveWoman 2 +2 Charm, +2 Personal Security
-TimidWoman 3 -3 charm, +2 PersonalSecurity
-DesperateWoman 3 -3 charm
-SpiritedWoman 2 +2 Charm
-FaithfulWoman 3 +1 Loyalty, +2 Charm
-UnchasteWoman 2 -2 charm
-VapidWoman 3 -2 charm
-EducatedWoman 3 +2 charm
-PassionateWoman 3 +2 Charm, increase chance to have children
-ColdWoman 3 -2 Charm, decreases chance to have children
-BigotWoman 3 -3 charm
-TolerantWoman 3 +3 Charm
-DykeWoman 2 -1 Charm, decrease chance to have children significantly
-FertileWoman 3 increases chance to have children
-InfertileWoman 3 decreases chance to have children
-FairWoman 3 +3 Charm
-HarshWoman 3 -3 charm
-GoodPrincess 4 +4 Charm
-BadPrincess 3 -3 charm
-NaturalPrincess 3 +3 Charm

-GoodMerchant 4 +4 Finance
-BadMerchant 3 -3 Finance
-NaturalMerchantSkill 3 +3 finance
-ExoticTastes 3 -2 finance, -1 personal security
-MerchantEnemies 3 -4 Personal Security
-Monopolist 3 +3 Finance, -1 Personal Security
-ShadyDealer 2 -2 Finance
-LegalDealer 2 +2 Finance
-SecureMerchant 2 +2 Finance
-SecurityMerchant 2 -1 Finance, +2 Personal Security
-ServesSelfMerchant 2 -2 finance
-ReligiousMerchant 2 -2 Finance
-WorldyMerchant 2 +2 Finance
-MerchantsGuildMember 1 +1 Finance
-MerchantsGuildTrained 1 +1 Finance

-GoodSpy 5 +5 Subterfuge, +4 LineofSight
-BadSpy 3 -3 Subterfuge
-GoodConspirator 3 +3 Subterfuge
-BadConspirator 3 -3 Subterfuge
-NaturalSpySkill 3 +3 Subterfuge
-ThievesGuildMember 2 +2 Subterfuge
-TheivesGuildTrained 1 +1 Subterfuge

-GoodAssassin 5 +5 Subterfuge
-BadAssassin 3 -3 Subterfuge
-GoodConspirator 3 +3 Subterfuge
-BadConspirator 3 -3 Subterfuge
-NaturalAssassinSkill 3 +3 subterfuge
-AssassinsGuildMember 2 +2 Subterfuge
-HashashinGuildMember 2 +2 Subtefuge
-AssassinGuildTrained 1 +1 Subterfuge
-GoodSaboteur 3 +3 Subterfuge
-BadSaboteur 2 -2 Subterfuge

-GoodDiplomat 5 +5 Influence
-BadDiplomat 3 -3 Influence
-SmoothTalker 3 + 30 bribery
-Talkative 3 -3 Influence, -5 Bribery
-Secretive 3 +3 Influence, +10 Bribery
-NaturalDiplomatSkill 3 +3 Influence
-Multilingual 3 +3 Influence
-ReligiousTolerance 3 +3 Influence
-ReligiousIntolerance 3 -3 Influence
-BraveDiplomat 3 +3 Influence, -1 PersonalSecurity
-CowardDiplomat 3 -3 Influence, +2 PersonalSecurity

-NaturalPriestSkill 3 +3 Piety
-GoodDenouncer 5 +5 Piety
-BadDenouncer 3 -3 piety
-Warmonger 3 +3 Violence
-Peaceful 3 -3 Violence
-Corrupted 3 -3 Purity
-Righteous 3 +3 Purity
-SecretlyFemale 1 +1 Piety, -1 Eligibility, +1 Purity, -1 Violence
-StrongFaith 4 +4 Piety
-WaeringFaith 4 -4 Piety
-Dogmatic 3 -3 Unorthodoxy
-OpenMinded 3 +3 Orthodoxy
-DivineProtection 3 +2 Piety, +2 Violence
-Doomsayer 3 +2 Unorthodoxy, -2 Violence
-Purifier 3 +3 Piety, +2 Eligibility, +3 Purity, +2 Violence
-Missionary 3 +3 Piety, +2 Eligibilitym +3 Purity, -2 Violence
-TheologiansGuildMember 2 +2 Piety
-TheologiansGuildTrained 1 +1 Piety

Admiral Traits
-Sailor 5 +5 Naval Command
-LandLubber 3 -3 Naval Command
-FamousPirate 3 -3 Loyalty, +3 Naval Command

Heretic Traits
-NaturalHereticSkill 3 +3 Piety
-GrowingConviction 3 +3 Piety
-WaningConviction 3 -3 Piety

Witch Traits
-NaturalWitchSkill 5 +5 Magic

Universal Traits
-LaxPersonalSecurity 3 -4 PersonalSecurity
-HighPersonalSecurity 3 +4 PersonalSecurity

You add an ancillary in much the same way a a trait, cheat menu, enter give_ancillary "Charactername" Ancillaryname Level. Most are level one but some have extra levels so play about. Allso some ancillary are contradictory so dont blame me if they sometimes dont work. The maximum level for any of them is 5 so dont experiment too hard. These traits only apply to some character types so use some logic when applying (eg fine cosmetics are obviously for your princess unless you like your generals fabulous). The latter of these are unique ones (eg Michealangelo) apply these sparingly im not sure of the consequences if you dont.

apothecary
alchemist
adultress_she_man
adultress_foreign
accomplice
academic_advisor
actor
architect
armour_custom
armour_ornate
artist
assassins_apprentice
assassins_blade
astrologer
bard
beguiling_bard
biographer
black_stallion
bodyguard
brilliant_inventor
caravan_driver
catamite
chastity_belt
choir_boy
counterfeiter
courtesan
crooked_judge
dancer
dark_apprentice
deacon
delicate_blade
diplomatic_escort
doctor
drillmaster
enchanted_broom
eunuch
evil_mother-in-law
executioner
explosives
exotic_gifts
faithful_servant
false_documents
false_relic
femme_fatale
fine_cosmetics
foodtaster
fool_brilliant
fool_usual
foreign_dignitary
handgun
harsh_judge
herald
intrepid_explorer
knight_beserker
knight_chivalrous
knight_crusader
knight_dread
knight_santiago
knight_stjohn
knight_templar
knight_teutonic
lancebearer
librarian
magician
magician_pagan
master_mason
master_of_archers
master_of_assassins
master_of_horse
master_smith
mathematician
mentor
mercenary_captain
merchant_clerk
military_engineer
money_counter
monk
musician
naval_gunner
naval_navigator
naive_knight
nosy_mother
nun
obsessed_suitor
ordinance_master
overseer
paladin
pet_bloodhound
pet_guarddog
pet_monkey
physician
pickpocket
poisoner
priest
quartermaster
royal_escort
royal_seminarian
runner
scout
scribe_ancillary
secret_love
shieldbearer
shipwright
siege_engineer
slaver
smothering_bodyguard
soothsayer
spyglass
spymaster
strapping_stallion
stunning_handmaiden
swift_steed
swiss_guard
swordbearer
tax_farmer
the_lemegeton
torturer
translator
treasurer
trick_abacus
trusty_steed
tutor
veteran_warrior
witch_hunter
yappy_little_dog
zealous_disciple
shard_of_the_true_cross
holy_lance
holy_grail
iron_crown_of_lombardy
bridle_of_constantine
holy_chalice
veil_of_veronica
icon_not_made_by_hands
holy_prepuce
crown_of_thorns
holy_shroud
ark_of_the_covenant
seal_of_solomon
hair_from_mohammeds_beard
mohammeds_footprint
holy_mantle
tooth_of_mohammed
key_to_holy_kaaba
lock_of_kaaba
sword_of_mohammed
fragment_of_the_black_stone
holy_quran
soil_from_mohammeds_grave
standard_of_mohammed
sir_william_wallace
joan_of_arc
peter_the_hermit
bertrand_du_guesclin
chevalier_de_bayard
pierre_abelard
francesco_petrarca
roger_bacon
geoffrey_chaucer
john_wycliffe
simon_de_montfort
amerigo_vespucci
niels_ebbesen
vlad_tepes
meister_eckhart
arnold_von_winkelried
john_gutenberg
hildegard_von_bingen
martin_luther
paracelsus
johannes_faustes
aldus_manutius
marco_polo
donatello
raphael
michaelangelo
machiavelli
george_of_antioch
francis_of_assisi
vasco_de_gama
anthony_of_padua
taticius
nicolau_copernicus
ibn_khaldun
albertus_magnus
jan_zizka
roger_de_moulins
gerard_de_ridefort

If you notice any problems with this guide please post them, its hastily put together at best, and if you find any more traits or ancilliarys post them too for me to add. Thanks.