Doll, maid, bunny girl are great staple, though I also like some more robot, drone and toy...

Unaware hypnosis (victims still think it's their normal life), or aware but with altered common sense.

A collar, B color

Prelate concept from Archie Sonic?

鸦 (simplified), 鴉 (traditional), yā (pinyin) is chinese for corvus in general, with specific species denoted by combining glyphs:
乌鸦（crow）
渡鸦（raven）
寒鸦（jackdaw）
老鸦（rook）
"Quạ" in vietnamese for crow/raven/corvus in general, it's onomatopoeic.