Give me a musical, and I'll summarize the characters. Leads only, if it's a large cast, side characters included, if it's small and I know enough about it.
These'll be dreadful summaries, so... You've been warned.
If I don't know the musical, I'll look it up on Wikipedia. :'D
I MIGHT do books, movies, games, etc, etc, IF I know what you listed is.
Maybe I'll put an example, maybe I won't.