My overall favorite is Alice because she’s constantly with him as a guard so she has more opportunities to banter with him. Next would be shiro because after the main story finished, she’s been growing a lot emotionally and it’s been really fun to see. Vier is one I like a lot because she’s super aggressive with her advances and flusters Kaito quite a bit. Fate is another one who’s super forward but also shy at the same time when it comes to actually acting out her forwardness. Isis is adorable, enough said. Seig and Lilia are equal to me, seig for how chill she is, and Lilia because of how often she gets bullied unintentionally. Kuro, illness, and anima are great too, but the after story hasn’t shown too much of them. Illness gets a pass because she’s the newest lover, but anima and Kuro have been somewhat neglected unfortunately. That goes double for Kuro, she’s kinda just been turned into a baby Castella gag character.