Harry Potter Game the_witch_hunt is a small, plot-focused game set in 2004 where the biggest threat to wizards is Muggles. We have an extensive amount of world-building done, but there is lots of room for more!
As far as characters, we'd love to see Rolf Scamander, more Weasleys, members of the Non-Wizard Retrieval Unit, Obliviators, characters interested in researching how magic and electricity work in relation to each other, and people who work for the Magical Law Enforcement Patrol. Also, any character who might be involved in politics at the Ministry would have a lot of plot as well.