make it easier to see slave rarities, i think the only place we can check that is when buying/selling them on the market... we need to be able to see it on the long servant list

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also let us sort them by names/rarities/level/relationship etc
like for example, i check their profiles to see which slaves is in bad relationship with a lot of people, but then takes forever to find them (if owning 100+ slaves) if i want to sell them, even if i know their name(or just let us sell a slave in their profile instead of going to the market...)
oh, interesting about the level = rarity, i just tried to level one of the blue charas i was keeping and she turned into legendary lol
but that makes it too easy for us to get legendary slaves, should be like 10/20% chance for any chara we get to be legendary (maybe not as bad as gacha games, but surely not as easy as it is here)
Maybe over the altar as "special summoning". Just make sure don't kill your legendary in battle ^^.
Nymphomania: Fantasy Town does this with it's Portal system. A and S Ranks comes with an hefty pricetag there. And has a cooldown timer or you pay even more. Farming Gems, Science and Gold for special servants could be worthwhile since science points are useless if you unlock everything you want already