First things first, enabling the console.

Open the game directory. (Right-click game in steam > properties > local files tab > browse local files)

Once there, go to renpy > common
Then find the file 00console.rpy
Open it in your preferred text editor and look for the line "config.console = False"
Change it to "config.console = True"
Save and close the file, and you've enabled console

To bring it up in game, press Shift + O (That's the letter, not zero)

*Use of the console can break your game or introduce bugs that wouldn't otherwise exist, so if you ever get a bug whilst console is enabled, or with a save that has had anything altered with console, include that in a potential bug report. (TL;DR: you're responsible for the mess you make)
**Bear in mind that the devs can probably completely remove the ability to enable the console if they want to.
***This guide may or may not contain spoilers, but i will not use any black bars.

Now that you've enabled the console, you need something you can do it with, so here is a list of a few commands.

player_actor.full_heal()
- Heals the player character completely.

set_level(player_actor, 50)
- Sets the designated characters level, haven't yet checked what the name is for all of them yet, will come back to this.

player_actor.strength += 1
player_actor.defend += 1
player_actor.intel += 1
player_actor.res += 1
player_actor.agi += 1
- Above commands increase the stat by 1, you can also use -= 1 to reduce it, aswell as any other number. Finally, you can directly set it by just using =, like with money below.

Money = 1000000
- Sets your current amount of money, can also be used with += and -=, like any other number variable.

special_inv.append(angel_wings)
- Adds the special item angel wings to inventory, which reduces all travel time to 5 minutes and remove combat time entirely.

food_inv.add(seafood_soup, 1)
- Adds items to the food inventory, refer to the food item list.

player_inv.add(magic_essence, 1)
- Adds items to the players inventory, in this case, 1 Magical Essence, refer to the item lists.

player_actor.change("hp", 1337)
- Change any value, you can replace "hp" with things like def, res, str, agi, int, mp, and so on.

This section contains the ID's of all items that go into the special_inv

Maria's Charm
ID = maria_charm

Dungeon Manual
ID = dungeon_manual

Salamander's Tail
ID = salamander_tail

Lily's Spirit Signal
ID = lily_ss

Maria's Spirit Signal
ID = maria_ss

Dolly's Spirit Signal
ID = dolly_ss

Iris's Spirit Signal
ID = iris_ss

Felina's Spirit Signal
ID = felina_ss

Arisa's Spirit Signal
ID = arisa_ss

Rocky's Core
ID = m_golem_core

Fafnir's Jewel
ID = fafnir_jewel

Fafnir's Recharged Jewel
ID = fafnir_jewel_2

Powered Boots
ID = powered_boots

Angel Wings
ID = angel_wings

Dimensional Pocket
ID = dimensional_pocket

Ren's Fan
ID = ren_fan

Dragon Crystal
ID = dragon_crystal

Recovery Kit
ID = recovery_kit

Arcane Scroll
ID = arcane_scroll

Ino's Hairpin
ID = ino_hairpin

Magic Goggles
ID = magic_google

Shop Key
ID = shop_key

Yami's Token
ID = yami_token

Lucifer's Token
ID = lucy_token

Phantom's Token
ID = phantom_token

Garde's Token
ID = garde_token

This section contains IDs for all food items, for use with food_inv (for food materials, check the material section)

Emilia's Lunch Combo
ID = emilia_lunch

Apple
ID = apple

Strawberry
ID = strawberry

Banana
ID = banana

Sunny Side Up
ID = sunny_side_up

Bread
ID = bread

Cheesecake
ID = cheesecake

Fruit Cake
ID = fruit_cake

Apple Pie
ID = apple_pie

Meat Stew
ID = meat_stew

Fresh Sushi
ID = fresh_sushi

Smoked Salmon
ID = smoked_salmon

Fish Pate
ID = fish_pate

Pate Baguette
ID = pate_bread

Fried Fish
ID = fried_fish

Rejuvenating Soup
ID = rejuvenating_soup

Seafood Soup
ID = seafood_soup

Deluxe Meal
ID = deluxe_meal

Mushroom Noodle
ID = mushroom_noodle

Cutlet Bowl
ID = cutlet_bowl

Mixed Pizza
ID = mixed_pizza

Royal Hot Pot
ID = royal_hot_pot

This section contains IDs of all materials, for use with player_inv

Iron
ID = iron

Silver
ID = silver

Mythril
ID = mythril

Platinum
ID = platinum

Dragon Scale
ID = dragon_scale

Adamantite
ID = adamantite

Wool
ID = wool

Spider Web
ID = spider_web

String
ID = string

Ribbon
ID = ribbon

Cloth
ID = cloth

Wool Cloth
ID = wool_cloth

Silk
ID = silk

Satin
ID = satin

Magic Cloth
ID = magic_cloth

Garnet
ID = garnet

Aquamarine
ID = aquamarine

Citrine
ID = cytrine

Onyx
ID = onyx

Tiny Fang
ID = tiny_fang

Light Feathers
ID = light_feathers

Leather
ID = leather

Rough Skin
ID = rough_skin

Soft Fur
ID = soft_fur

Quills
ID = quills

Turtle Shell
ID = turtle_shell

Magic Goo
ID = magic_goo

Tough Leather
ID = tough_leather

Sharp Fang
ID = sharp_fang

Blue Shell
ID = blue_shell

Demon Horn
ID = demon_horn

Mystic Fur
ID = mystic_fur

Metal Goo
ID = metal_goo

Chimera Hoof
ID = chimera_hoof

Concentrated Venom
ID = concentrated_venom

Rainbow Prism
ID = rainbow_prism

Ancient Tusk
ID = ancient_tusk

Amber Beak
ID = amber_beak

Black Mythril
ID = black_mythril

Iron Sand
ID = iron_sand

Egg
ID = egg

Flour
ID = flour

Cheese
ID = cheese

Lemon
ID = lemon

Raw Meat
ID = raw_meat

Potato
ID = potato

Herbs
ID = herbs

Wild Mushroom
ID = wild_mushroom

Shrimp
ID = shrimp

Tuna
ID = tuna

Trout
ID = trout

Eel
ID = eel

Squid
ID = squid

Salmon
ID = salmon

Lobster
ID = lobster

Swordfish
ID = swordfish

This section contains the IDs of all weapons, for use with player_inv

Wooden Katana
ID = wooden_katana

Odachi
ID = odachi

Kanshou
ID = kanshou

Bakuya
ID = bakuya

Onimaru
ID = onimaru

Kiku-Ichimonji
ID = kiku_ichimonji

Asura
ID = asura

Masamune
ID = masamune

Muramasa
ID = muramasa

Wooden Sword
ID = wooden_sword

Iron Sword
ID = iron_sword

Mythril Blade
ID = mythril_blade

Claymore
ID = claymore

Flamberge
ID = flamberge

Durandal
ID = durandal

Excalibur
ID = excalibur

Blood Sword
ID = blood_sword

Wooden Rod
ID = wooden_rod

Iron Rod
ID = iron_rod

Ocean Rod
ID = ocean_rod

Wizard Rod
ID = wizard_rod

Mystic Rod
ID = mystic_rod

Volcanic Rod
ID = volcanic_rod

Prism Rod
ID = prism_rod

Icarus
ID = icarus

Paper Fan
ID = paper_fan

Dictionary
ID = dictionary

Thunder Tome
ID = thunder_tome

Frosty Memoir
ID = frosty_memoir

Holy Tome
ID = holy_tome

War Grimoire
ID = war_grimoire

Encyclopedia
ID = encyclopedia

Niflheim
ID = niflheim

Yellow Bell
ID = yellow_bell

Silver Bell
ID = silver_bell

Healing Chime
ID = heal_chime

Demonic Chime
ID = demon_chime

Hell's Lullaby
ID = hell_lullaby

Seraphic Bell
ID = seraphic_bell

Bell of Chaos
ID = bell_of_chaos

Iron Lance
ID = iron_lance

Steel Spear
ID = steel_spear

Knight Lance
ID = knight_lance

Mythril Halberd
ID = mythril_halberd

Longinus
ID = longinus

Dragon Lance
ID = dragon_lance

Gae Bulg
ID = gae_bulg

Gungnir
ID = gungnir

Cat Claws
ID = cat_claws

Silver Claws
ID = silver_claws

Mythril Claws
ID = mythril_claws

Vampire Talons
ID = vampire_talons

Tiger Claws
ID = tiger_claws

Platinum Claws
ID = platinum_claws

Death's Grip
ID = death_grip

Blank Chip
ID = blank_chip

This section contains the IDs of all armor, for use with player_inv

Kunoichi Outfit
ID = kunoichi_outfit

Light Armor
ID = light_armor

Enchanted Dress
ID = enchanted_dress

Cheongsam
ID = cheongsam

Lingerie
ID = underwear

Clothes
ID = clothes

Leather Vest
ID = leather_vest

Wool Sweater
ID = wool_sweater

Silk Clothes
ID = silk_clothes

Hunter Outfit
ID = hunter_outfit

Feral Tunic
ID = feral_tunic

Ranger Cape
ID = ranger_cape

Master Gi
ID = master_gi

Battle Suit
ID = battle_suit

Assassin Garb
ID = assassin_garb

Beastmaster
ID = beastmaster

Desert Vest
ID = desert_vest

Heroic Cloak
ID = heroic_cloak

Dragon Tunic
ID = dragon_tunic

Iron Armor
ID = iron_armor

Silver Chainmail
ID = silver_chainmail

Silver Breastplate
ID = silver_breastplate

Quill Armor
ID = quill_armor

Tortoise Plate
ID = turtle_plate

Mythril Chainmail
ID = mythril_chainmail

Mythril Armor
ID = mythril_armor

Platinum Armor
ID = platinum_armor

Bone Armor
ID = bone_armor

Azure Plate
ID = azure_plate

Jade Hauberk
ID = jade_hauberk

Black Mail
ID = black_mail

Dragon Cuirass
ID = dragon_cuirass

Sentinel
ID = sentinel

Apprentice Robe
ID = apprentice_robe

Silver Lace Gown
ID = silver_lace_gown

Warm Robe
ID = warm_robe

Silk Robe
ID = silk_robe

Slimy Robe
ID = slimy_robe

Magician Robe
ID = magician_robe

Witch Mantle
ID = witch_mantle

Satin Robe
ID = satin_robe

Gothic Dress
ID = gothic_dress

Spirit Vestment
ID = spirit_vestment

Rainbow Dress
ID = rainbow_dress

Mystic Shroud
ID = mystic_shroud

Luminous Gown
ID = luminous_gown

This section contains al IDs of accessories, for use with player_inv

Gladiator Ring
ID = gladiator_ring

Knight Ring
ID = knight_ring

Sorcerer Ring
ID = sorcerer_ring

Psychic Ring
ID = psychic_ring

Thief Ring
ID = thief_ring

Silver Ring
ID = silver_ring

Mystic Charm
ID = mystic_charm

Fire Bracelet
ID = fire_brace

Ice Bracelet
ID = ice_brace

Thunder Bracelet
ID = thunder_brace

Shadow Bracelet
ID = shadow_brace

Wild Necklace
ID = wild_neck

Feather Charm
ID = feather_charm

Dusty Charm
ID = dusty_charm

Titan Bracelet
ID = titan_brace

Ren's Ribbon
ID = ren_ribbon

Monkey Paw
ID = monkey_paw

Mini Barrier
ID = mini_barrier

Leather Sash
ID = leather_sash

Trainee Gloves
ID = trainee_gloves

Jeweled Necklace
ID = jeweled_necklace

Lucky Charm
ID = lucky_charm

Garuda Charm
ID = garuda_charm

Tiger Eye
ID = tiger_eye

Champion Badge
ID = champion_badge

Paladin Badge
ID = paladin_badge

Archmage Badge
ID = archmage_badge

Templar Badge
ID = templar_badge

Assassin Badge
ID = assassin_badge

Heroic Crest
ID = heroic_crest

Berserker Soul
ID = berserker_soul

Guardian Soul
ID = guardian_soul

Dragon Soul
ID = dragon_soul

Mythril Bangle
ID = mythril_bangle

Adamantite Guard
ID = adamantite_guard

Molten Amulet
ID = molten_amulet

Frost Amulet
ID = frost_amulet

Thunder Amulet
ID = thunder_amulet

Shadow Amulet
ID = shadow_amulet

Twilight Bangle
ID = twilight_bangle

Demonic Ring
ID = demonic_ring

Demonic Ring II
ID = demonic_ring_2

Seraphic Ring
ID = seraphic_ring

Seraphic Ring II
ID = seraphic_ring_2

Fiery Core
ID = fire_core

Freezing Core
ID = ice_core

Lightning Core
ID = thunder_core

Shadow Core
ID = dark_core

7 Colored Amulet
ID = _colored_amulet
*Yes, this one starts with an _, it is not a mistake.

Holy Emblem
ID = holy_emblem

Dragon Jewel
ID = dragon_jewel

Power Wrist
ID = power_wrist

5-leaf Clover
ID = five_leaf_clover

Crest of Nobles
ID = noble_crest

Spirit Emblem
ID = spirit_emblem

Midas Gloves
ID = midas_gloves

Phantom Mask
ID = phantom_mask