• Main story - 2-3 quests
• Kitty quest with Klio, Aya, Misty and Bastet. Event and sex scene with Bastet
• Fiona - finish main quest, maybe 1-2 events
• Alice - finish main quest, maybe 1-2 events
• Lina - finish books quest, 1 event with her and Aya
• Aeria - 1-2 quests, improve outfits event
• Imira - 1-2 quests and 1 event
• Aqua - 1-2 quests and 1-2 events
• Kaiah - 1-2 quests and 1-2 events
• Yui - 1-2 quests and 1-2 events
• Aya - at least 1 quest
• Daphne - 1 quest or event 
• Aylen - at least 1 event and a sex scene
• Helen - at least 1 event and a sex scene
• Atub - 1 event and a sex scene
• Drow and dragon (they won't have much content, maybe few events at most)
• Quest in Mysterious Hotel
• Pregnancy!

The list is not complete, I may add more