Ooh, yes, this! That's one thing I love about generic characters in RPGs (mainly strategy RPGs). Since they say nothing and have no real personality, I make it up in my head. When I use certain characters together enough, I form ideas for what kind of interaction they would have. The way I customize their equipment and skills also gives me ideas, sometimes for different kinds of characters. (like, say, that one time I gave a Bard in Final Fantasy Tactics a Katana and Teleport, gave me a weird idea for a character) Or, sometimes some of the strange methods of changing classes gives me ideas as well. (take the Beast Tamer's from Ogre Battle...they are bald old men in loin cloths, but when they get promoted to a Dragon Tamer, they suddenly are young, have long flowing hair, and look like girls a little, I thought they were girls the first time...so, picture a character like this! Think of a story to explain this transformation from a half-naked old man into a young warrior lady!) Inspiration really does come from anywhere.