I try to use verbal material as much as I can in my design, so much that characters are defined by Traits (Fate "Aspects", Risus "Cliches", many games "Skills").
I'd also like to add a "character progression" mechanic to my one-shooter, because why not. Me and my partner were going for XP but I approach reward with Rickard Elimaa's caveat in mind that it better be intrinsic.
So I came up with that incentive : at the end of a session, each player writes a Trait for each character. If two traits match for a character, the character gains it. It's an incentive to roleplay clearly.
Do you think it can work ? Have you experienced it in a game ? maybe in a board game ?
(rambling : Maybe I should change the number of matches to gain the Trait : 3 ? a quorum of 2/3 N ? N-1 ? where N is the number of players. Should I exclude the playing player of each character ? etc.) : all this is unnecessary rambling. Rules redaction dictates that 2 be the number, because natural language leads to this.