Question: are dean thomas and seamus finnigan a couple?
Answer: It is said that J.K. Rowling was planning on making Dean Thomas and Seamus Finnigan a couple, but she ended up not doing it because she didn't want to take too much attention away from the Trio. Therefor technically, yes, Deamus could be considered CANON. Find this Pin and more on Harry Potter by Courtney Seelke.