I'm rather White currently. I like to play massive enchantment effects which coddle and console me, like a blanket fresh out of the dryer.
Though currently I am really enjoying Black/Green...because sometimes you just have to pound faces in.
Yeah, I nearly got smacked down hard for equating the 5 colors of magic to a different kind of intimate companion...
White - A comforting soul and stalwart protector with impeccable aesthetics yet displaying amazing temperance. Always ready with a warm smile, a loving embrace and a soothing touch.
Black - So naughty, the sort that likes to inflict pain upon you. But the pain teaches you and makes you stronger, a better person, and will show you the way to destroy your enemies with a skillful, calculated touch.
Blue - Mysterious and unfathomable, the kinda person that once you think you have it figured out will change and remold. You constantly chase them, and they love run from you to do their own thing, but can only grasp at vapor...but it sure is fun unravelling these enigmas if this is the kind of companion you want.
Red - The passionate wild-child so expect a roller-coaster of angry-highs and even angrier lows. The kind that enjoys constant physical testing like wrestling and just when you think you've them pinned, they will smack you with a surprise hook to the face and bite your hamstring with an amazing reach and super-fast reflexes!
Green - Playful, quizzical, and kinda like a very big dog that's a loyal, striaghtforward companion (and cute). No tricks, no surpsises, just constant, steady and stong and values the same in you. Can be rather spiteful against those that are not simpatico (like black, blue).