Okay, here's Jack (I've not seen much past Series Two of TW, so I have no actual canon from that time period)

-Colour Synesthesia for his name:
- Accidentally 'wrote' a number of WWII songs due to them having a revival in popularity when he was a child. He sang them, and they caught on in WWII period, but they hadn't been written yet. It's a stable time loop.
- Likes to dance, a lot, and knows hundreds of styles from many time periods and galaxies. Will demonstrate if you get him drunk enough.