1. Make sure they're recruitable
   
2. They have to be above 2 hearts ❤❤

NOTE: if you have additional information to recruit certain monster girls, please comment and let me know!

No. 001 - 002 Slime, Yellow Slime

• You have to let them hit you, and don't hit back.

No. 003 Poison Slime

• You have to become poisoned by them. Chances to friend increase with heart.

No. 004 Pink Slime

• Max her heart, and have "Slime" with you.

No. 005 - 008 Queen Slime, Honey Slime, Venom Slime, Succubus Slime

• Max her heart, and have "Slime" that can be enhanced by Melt

No. 009 Were Wolf

• Fight her; each other's HP should be slightly low.

No. 010 Fenrir

• Fight her; each other's HP should be low.

No. 011 Red Fang

• Fight her; each other's HP should be very low.

No. 012 Kerberus

• Fight her; each other's HP should be extremely low.

No. 013 - 016 Were Cat, Nekomata, Cait Sith, Baster

• You have to give them silver vine.

No. 017 - 018 Fairy, Periwinkle

• Ignore her hit several times.

No. 019 Flame Lily

• Cool her down with Grimoire of Ice Magic; once the ice breaks she should be friendable.

No. 020 Titania

• Ignore her hit several times.

No. 021 - 022 Aery, Sylph

• Max her heart.

No. 023 - 024 Tempest, Jinn

• Read several Grimoire of Swift to become the same speed as them.

No. 025 Alraune

• Give her a Revival Fruit.

No. 026 Delphine

• Max her heart, and having Alraune in your party.

No. 027 Nemophilia

• Max her heart, and having Delphine in your party.

No. 027 Dandelion

• Give her a Revival fruit.

No. 029 - 031 Bee, Slow Bee, Paraly Bee

• Invite them, and they will ask you to pay for a fee to hire them.
  
• Fees: Bee = 2,000 gold, Slow Bee = 5,000 gold, Paraly Bee = 20,000

No. 032 ?????
No. 033 - 035 Lamia, Medusa, Echidna

• You have to catch a Fox (any kind) while it is still transformed into an item.
  
• To do this, have one of your companion set to [WAIT] in line directly with the item in question.
  
• Walk to the further opposite side of the item
  
• Set companion to [FLW], and once they are on the item set them again to [WAIT]
  
• Switch places with your companion, go to the menu and select "On Ground"
  
• When a Lamia/Medusa asks you for something "soft", give them the item.

No. 036 ?????
No. 037 - 38 Lizard, Blue Lizard

• You have to give her a weapon or shield that has two or more mark. For Blue Lizard, three or more mark.

No. 039?????
No. 040 Trainee Elf

• Give her "Big Bread".

No. 041 Elf

• Give her "Magic Bread"

No. 042 Dark Elf

• Max her heart, and use "Grimoire of Explosion" by her.

No. 041 High Elf

• Give her "Large Bread".

No. 044 - 045 Naughty, Imp, Brownie

• You have to give her a stolen item from Tanuki's shop (from the same floor).

No. 047 Gremlin

• You have to give her a stolen item that is worth more than 5,000 coins from Tanuki's shop (from the same floor).

No. 048 Forest Slug

• You have to give her a sword or shield that has been upgraded to +3 or greater.

No. 049 Mountain Slug

• You have to give her a sword or shield that has been upgraded to +5 or greater.

No. 049 Freelance Slug

• You have to give her a sword or shield that has 3 or more marks.

No. 051 - 054 Succubus, Empusa, Hekate, Lilyth

• Be able to prevent their Charms. Chances of success depends with the level of heart.
  
• Make sure to have eaten Pumpkin Soup (prevents Charm) from Coco before.

No. 055 - 056 Harpy, Mayu Sibayu

• You have to give them any rings.

No. 057 Jabberwock

• You have to give her any ring worth more than 5,000 coins.

No. 058 Seiren

• You have to give her any ring worth more than 10,000 coins.

No. 059 - 061 Griffin, Cockatrice, Quetzalcotl

• You have to give them "Nale Article".

No. 062 ?????
No. 063 - 064 Mermaid, Merrow

• You have to give them "Smooth Conditioner".

No. 065 Loreley

• You have to give her "Sake MURAICHIBAN".

No. 066 Undine

• You have to give her "Smooth Conditioner".

No. 067 - 069 Scylla, Tentacle, Kraken
list]

• Max their hearts.
  
• You have to be alone to be able to recruit her.

No. 071 - 072 Gargoyle, Guardian

• You have to be stronger than her. Chances depends on level of heart.

No. 073 ?????
No. 074 - 077 Were Rabbit, Amazones, Zulur, Carbuncle

• Depends on damage in one hit. Chances depends on level of heart.

No. 078 - 079 Were Bat, Hematophagus

• Talk to a bat that is under the command of either Vampire/Rich
  
• Give them "Grimoire of Dispel".
  No. 080 Dark Bat
  No. 081 - 83 Blue Witch, Purple Witch, Red Witch
  
  • Give them "Cacao Cake".
  No. 084 - 86 Goblin, Hob Goblin, Goblin Hero, Goblin Lord
  
  • You have to give them "Sake MURAICHIBAN".
  No. 088 - 089 Ogre, Ogre Head
  
  • Win their power contest.
  No. 090 ?????
  No. 091 - 092 Moth, Artemis
  
  • Give them any fruits that are Frozen.
  No. 094 Vampire
  
  • Give her 100 HP.
  No. 095 Rich
  
  • Give her 150 HP.
  No. 096 ?????
  No. 097 - 98 Dragon, Blue Dragon
  
  • Win their power contest.
  No. 099 Dark Dragon
  No. 100 - 101 Shi no Tsukai, Shinigami
  
  • Max their hearts.
    
  • Make sure you're in GOOD standing.
    
  • To do this, make sure to give other monsters gifts and let them walk away instead of fighting them twice in a row.
    
  • (Shinigami) To reach GENTLE, do this three times.
  No. 102 ?????
  No. 103 - 106 Fox, 2tails Fox, 3tails Fox, 4tails Fox
  
  • You have to give them any "Abuurage" items.
  No. 107 - 108 5tails Fox, 6tails Fox
  
  • You have to give them "Legendary Abuurage"
  No. 109 - 111 7tails Fox, 8tails Fox, 9tails Fox
  
  • You have to give them "Magic Ball"