Some are these are actually canon and are mentioned in the books
Harry:
Singing and rapping. (Only because Daniel Radcliffe can sing/rap.) Also because..you know..the main character always sings 🙄✋
Ron:
He's very good at knitting/crocheting (because of his mom) and often makes you hat and scarfs. If he's bored enough he'll make you plushies.
Draco:
He is a very good ballet dancer. (ironically) it's hot
Fred:
Fred is a good dancer in general. If he was a muggle he would probably be a hip-hop street dancer. (New script unlocked) *AHEM* also very hot
George:
He's amazing at painting and would paint you all the time. (You don't know about it though)
Neville:
Besides Herbology and dancing he is really good at baking
Tom:
Eating. I shouldn't have to explain.
Cedric:
He's oddly good at crossword puzzles. He also knows how to play the violin
Oliver:
Besides Quidditch he is also very good at decorating and playing soccer. (after Dean and Seamus taught him.)
Seamus:
During the summer when he's with his family in the muggle world he help's his dad with his car. I feel like he would be really good at fixing/making mechanical stuff
Dean:
Dean is very good at drawing (mentioned in Harry Potter and the Philosopher's stone.)
