I think I may go crazy trying to remember what these three animes are called that I watched quite a few years ago.
The first I can only remember two character names Pandora (Marie on Earth) and Queen Hera they both have long pink hair. The main male character has brown hair and is the chosen one (I think that's what they called him)... Pandora has a partner he's some kind of green alien. Pandora gets killed trying to protect the main male character from X. It's set on Earth first then moved into space.
The second I don't remember much of anything... The main male develops some kind of powers and is aided by a large lion. There is a nother male character (rather messed in the head if I remember correctly) he posesses a black book (kind of like "the devils book" or something). They have a female classmate that he ends up "killing" as a sacrafice (she's blond I think) only for her to come back to life at the end to save the lead male character.
There is a third but I remeber even less about that one... Some girl who's species has antenae on their heads that can resemble their hair when down (sad that's all I can remember eh?)
I know this is all very very vague but it was a long time ago and I've tried every google search I could think of. I hope someone here recognizes my terrible descriptions somehow!