Wow...someone has been paying attention!
Yeah, that's the storyline I was aiming for...so he's a Severus Snape type fellow...except he has been outcast into Hufflepuff (and forgotten- he wants to make a name for himself) because he was supposed to be in Slytherin...Snape was outcast by his fellow Slytherins and the rest of the school.
Maybe he could be with either Arsenio, Riddle or Artus...act as a type of spy or look-out for them...because the teachers pretty much ignore him...he never gets in trouble and is very good at lying or making up excuses.