Michael has no real love interest in Angel Sanctuary.  There was one girl named Baru who was his friend but, she admired Lucifel.  During the battle Baru jumped infront of Lucifer to protect him from Michael, thus killing herself in the process.
(uhhh shades of Sara, I really don't get these girls killing themselves over these guys!!! Come on get over it already! It is not romantic at all its just plain retarded.  Sorry for the rant =^-^=back to Mika)
Mika is pretty much a loner and separates himself from the other angels.  He makes up lies about his appearance and spreads them around so there is an air of mystery surrounding him.  His best and only friend is Raphael.  He gave him the nickname Mika-chan.  Raphael is a whore-male who will screw anything he can get his crotch on. He doesn't believe in the "purity of angels" after an incident with Belial.  I think Raphael became a surrogate brother to Michael after Lucifer was cast out of Heaven.  He is the person Mika trusts the most.
Mika is uninterested in the political power struggles in Heaven.  He almost appears apathetic toward Sevothtarte/Metatron and Rociel.  His only desire is to fight.  When he learns that Setsuna is Alexiel he decides it would be excellent sport to fight with someone so powerful, so he picks a fight with him and they level Tokyo.
When Mika is not being a rage-a-holic he is generally a nice guy.  As long as you walk on egg shells around him you should be OK. =^-^=
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