Let us put every single answer we use on events and what they give. Some events are chance based, based on answer, but most are the same no matter what. I marked MVP on the really important ones. Please add your own answers and results to the list!

Mysterious Merchant
-I'll take the red one
-I'll take the blue one
-I'll take the yellow one
-I'll take the bitter brown one =>Nothing

Perpell's Candy
-Looks delicious => +10 Fatigue, +Charge Lv
-Don't mind me => +30 Mana, +30 Spell, +Charge Lv

Cerberus' Hole Digging
-I'll keep watch => Nothing / Curse / Item
-Stop it => Nothing

Ragon's Special Training
-Please do so => Nothing / +Lai Lv
-We'll pass

Training with Fegor (MVP)
-We'll accept => +Stats, +Multi-Attack Lv
-We'll pass

Elma's Home Cooking
-Blight Vegetable Soup
-Cream Stew => +10 Fatigue
-Dark Pot-Au-Feu
-Underworld Miso Soup => +30 Taste

A Challenge from Faust
-We'll take the challenge => +Stats
-We'll pass this time
-That aside, you should rest

It's On Me
-Hot Noodles => +10 Fatigue
-Curry => +10 Fatigue / +30 Charm, +Smart Saver Lv
-Steak => +10 Fatigue / +30 Aura, +Smart Saver Lv
-Exotic Sushi => +10 Fatigue

Turn Back the Clock
-This is Embarrassing!
-Might as well give it a try => +10 Fatigue / Training Days Reset, +Flash Step Lv
-Say it quietly => +10 Fatigue / Training Days Reset, +Flash Step Lv

Ergo's Special Training
-True... => Nothing / +Smash Lv
-Maybe next time... => Nothing

Training with Mammon
-We'll accept => +Stats, +Drop Rate+ Lv
-We'll pass

Searching the Castle
-Go to the Library => +Item
-Go to the Garden => Nothing
-Go to the Hall => Nothing / +3000g

Bunny Maid's Fear
-I'll hold onto it => +20 Aura
-Sure, you do that => +20 Mana
-Throw it away => +10 Mana

Training With Ruche
-Understood => + Stats +Magic Boost Lv
-No

Support from the Citizens
-I'm happy => -20 Fatigue +10 Taste
-I'm sorry

Nurse Special Medicine
-Let me think about it => Nothing
-Let's buy it (10000g) => +Item
-I'll Pass => -10000g, +Item

Playing With Cerberus
-Let's Play =>
--I'll bear =>
---This is fun! => Nothing / +10 Fatigue, +30 All Stats, +Magical Aura Lv, +Physical Aura Lv
---Stop! => +20 Fatigue, +20 All Stats
--I shouldn't force myself => +10 Fatigue
-Maybe Next Time => Nothing

Ergo and Ragon Duel (MVP)
-Very Well => +10 Fatigue / +30 Aura, +10 Reflex, +Multi-Attack Lv
-Stop it
-Are you sure?

Crying in the Night
-Let's not bother
-Let's go and check
-Could it be a ghost? => +10 Fatigue, +Survival Lv / +30 All Stats, +Ace Lv

Cat Maid's Discovery
-Tell Me
-Not Interested => +20 Taste
-Aren't you supposed to be working? => Nothing

Doctor's Warning
-Understood => -10 Fatigue
-Big Deal => +30 Fatigue / +30 All Stats, +Meditation Lv

Faust Private Lesson
-Try to stay awake => +30 Mana +30 Spell +EX Focus Lv
-Go to sleep

Overlords Fan Club?
-Let them in => +50 Taste +50 Charm
-Don't let them in
-I'll go and convince them => +50 Mana +50 Spell

Running Maids
-The City Inn
-The Valley of Swords => +20 Charm
-The Castle Gate
-The Dark Blacksmith

Fixing the Devil Projector
-Hit from the right => +50 Taste, +MP Shift Lv
-Hit from above => Nothing
-Hit from the left
-Hit the back

Devil Envoy's Resolve
-We'll win, together =>+30 Aura, +Demon Sarge Lv
-What a lucky family
-Anything to relay to your family?

Training with Ashmedia
-Will you do? => +Stats, +Armor Strike Lv
-No

Mokujin in Melancholy
-Don't be so sad
-I won't let that happen => +10 Fatigue, +3000K PTS, +EXP Boost Lv
-Leave it to me

Monitor's Challenge
-Let's go => +Stats
-Maybe next time
-I don't mind taking it on myself

House Keeper's Snack
-I'll pretend that I didn't see it => +20 Spell
-I'll need to report it => +20 Reflex

Soldiers and Training
-Very well. => +20 All stats.
-No.
-Can you clean?

Moody Underworld Sun
-Right? => +20 Mana +20 Spell
-Left?
-Front?

Training with Perpell
-Alright then => +Stats, +Item Bonus Lv
-Maybe next time

Training Room Cleaning
-Dust the ceiling => Nothing, +3000 gold
-Sweep the Floor => Nothing
-Polish Pillars => Nothing

Buyout Week
-Scratch <A>
-Scratch <B>
-Scratch <C>
-Scratch <D> => Item Sale Value +20%

Monitor's Whip of Love?
Do as you want => +30 Fatigue +50 Reflex +Defensive Lv
I'll pass

Discussion with Ragon
A quick way to gain power => +30 Mana +Far Cry Lv
An easy way to gain power
No, I'll pass

Lazy Day
-I'll draw some flip arts
-Let's drink more tea =>
--Let's make a card tower => -3000 PTS, -50 Fatigue, +Solid Mind Lv
--Let's drink more tea
-I'll think while I make a card tower

Oath of the Grave
I'm sorry
Thank you => Training EXP Double for 1 Day +Affection Shift Lv

The Meaning of Battle
No Hard Reason => +8000k PTS, +Affection Lv
I'm not sure
Death doesn't scare me! => Nothing

Fegor's Invitation
Great Idea! => Nothing
Just a little
No