Soooo yeahhh...very vague and cryptic...

what has everyone figured out so far for requirements for unlocking certain trophies? any ideas?

I think a lot of them involve performing a certain Blockbuster a few times, outside of training mode. I know a guy who has a few of the character-specific ones and that's as much as he has been able to figure out.

I'd keep an eye on PS3trophies.org, usually a good resource for that stuff. Few I know of are

Threads of Fate: Complete arcade with all characters (Including the locked 2) on any difficulty.

Skullgirls: Complete all tutorials.

Prolix: Has something to do with getting X number of combo word descriptions. (the words that appear at certain hit counts in combos). Nobody is sure on the exact number you need to see yet.

Happy Birthday: I haven't pulled this off yet, but I can only assume you get it for getting a happy birthday, would stand to reason.

Most of the others seem to be character-specific trophies.

@Addfwyn: I don't think the Happy Birthday is just for getting that as I got a few and no trophy

@Commisar123: I saw people claiming that they got it from getting a happy birthday. You might have to kill all the characters.