I'm a big fan of Heavy Gear. In DP9's Character Compendium 1, they introduced a tool which I'll probably start using in my DecTrek games. I thought others might also like it, so thought I'd share.
Basically it's an "attitude" chart and it's probably easier to just give an example:
Given a group of characters -- Yuri, Scot, Indira, Natasha and Suman -- each character is allowed one thought on each of the other characters.
Indira:
Yuri: Young and Naive, he's in for a big shock soon.
Scot: A clown, but he gets the job done.
Natasha: Hard working and efficient, she has a bright future ahead.
Suman: I need to keep an eye on him.
Natasha:
Yuri: A good friend, he knows what's important in life.
Scot: A good example of why I keep to myself.
Indira: I hope I don't end up like her.
Suman: He's okay if you treat him with respect.
I won't do all the characters, but you get the idea.
This can be used both for NPCs, and for PCs. I plan to do this to refine (or just plain generate) ideas for NPC interaction/relationships. With PCs, I'll probably have the players give me a new individual chart after the 1st episode (first impressions and all that), then every 3 or so episodes following. These charts aren't public, as a character's private thoughts might be radically different that his outward behavior.
Thoughts?
-- Daniel