I offer you Dino!
Dino is the seventh year who's spread out on the best couch of the Gryffindor common room, and he might be a touch oblivious to the feelings of other people, and for sure he's losing his house a lot of points for all the stupid things he does, but he's a nice guy, and he's willing to talk and be friendly with anyone!
In Reformation they've clearly worked together before. Dino is an oceanographer, but that and being a naturalist isn't mutually exclusive! Maybe they worked together on a specific project?
Also obviously Peeves. :)