I feel I should ask a couple simple questions before I get seriously started on my character, so, here goes.

The only major question I have is whether or not a Half-Breed, specifically the product of a Leprechaun and a Squib, would be acceptable as a player character. It's a concept I've always wanted to try and just never gotten a long enough run to do so. Granted I'd probably have to switch him from an Irish kid in Hufflepuff to...a kid from Boston in Tituba? Hmm.

As for minor things, while I know a person requires a license to handle a Kneazle, would it be possible to have one as a familiar since first year if said character passed off a Kneazle kitten as a regular cat and got the license in later years? If not, I understand and can just as easily have him acquire a Kneazle at a later date rather than as an admittance present from a mostly absentee father. 

Final question: I know I should probably wait for more information to be added into the OP but I can't help myself (if the answer to this question is edited in, boy, will I look silly.) are there any specifics regarding whether or not it's kosher to fill up positions such as Captains of various House Quidditch teams, Head Boy, etc? I apologize if the answers to any of these have been answered and I just haven't read stuff recently enough to know, in which case, feel free to call me an idiot. 

[s]I just want to be a lazy good for nothing Half-Leprechaun using his Kneazle to scam unsuspecting first years, dammit.[/s]