The bishounen character of the Evangelion series, Kaworu is most likely homosexual (or just completely oblivious to the taboos of male intimacy). Probably in love with Shinji Ikari. He killed a kitten once.
Kaworu Nagisa speaking to Shinji Ikari:
"You are delicate like glass."
"Yes, and that earns my sympathy."
"In other words, I love you."