Michael Corner

Who is Ginny dating?

She is dating Michael Korner.

That is correct.

Ding, ding, ding, ding, ding.

She's observant enough to be the only person to figure out that Hermione is attending with Viktor Krum.

And most significantly, the Yule Ball is where she meets Michael Corner.

Meeting Michael Corner is the catalyst for the complete transformation we witness in her fourth year during the Order of the Phoenix timeline.

She has taken Hermione's advice, she has a boyfriend, and the resulting shift in her demeanor is monumental.

The summer before her fourth year is spent at Grimmauld Place.

She catches the Snitch in her very first match, but it raises her behavior off the pitch that truly defines her evolving power dynamics.

Oh.

Gryffindor ends up losing a match to Ravenclaw, the house of her boyfriend, Michael Corner.