Riot Trio: Fred, George, Lee
Headmaster trio: Mme Maxime, Dumbledore, Karkaroff
Good teacher trio: Flittwick, Sprout, McGonnagal
Gross baby voldy trio: Pettigrew, Voldy, Barty Crouch jr
Lestrange trio: Bella, Rodolphus, Rabastan
Not good but can't be signed off as completely evil trio: Snape, Narcissa, Draco
Honestly I could go on and on and on but you named the most "important" ones