So this is an idea I got from a previous site I was on, but it's pretty simple! Just post songs (and lyrics, if you want) that you associate with your characters! Whether the whole song perfectly describes them / their situation or it' just a verse that kinda makes you think of them, I think it's a great chance to get a better feel for each others characters and find new music while we're at it!!
Example:
I've been listening to this song 'Heroes (We could be)' from Alesso feat: Tove Lo, it's a great song that describes Trixie. Trixie feels like she can't be one of the 'heroes' as she doesn't fully understand the world like the adults do at the moment. Although she does have some power just no one can see it yet, that's how she feels anyway .