Why not?
Name: Roman Howard
Preferences (weapons, stats, etc): Brilliant but lazy, seen-it-all type (high bravery, and accurate, TU maybe not so much), Likes big boom (Heavy weapons and anything equipable with HE ammo (and blaster launchers even, when researched)). Field medic (Medi-kit on hand (or in belt) at all times).
Bio: A resident Scientist/Medical Officer of the X-COM team; spent more time BS'ing with the soldiers and hitting on the medical staff, and while at it, being a bit of a stoner and a drunk for the better part of a day (at most hours, a combined stoned-drunk). He may not be professional by any means, but his results usually beg to differ (A bit of a bunny-ears lawyer kind). Having been fed up with his conduct enough (especially after the CO, along with half the staff got stoned by a "special" birthday cake Mr. Howard made for the crew in '98) he was sent to work with those he's more compatible with in order to be taught a lesson (out on the field with the very soldiers he BS's with). His response upon figuring out? "Challenge Accepted."
EDIT:
Of course, the "Special Birthday Surprise Incident" wasn't the only prank or "good idea" that came to mind. He was also a bit of an oddball and practical joker, with incidents ranging from: Tinkering with grenades (especially the training kinds to keep the troops on their game) so that they stay stuck to someone's hand, and light a concentrated blunt inside instead of a standard smoke grenade (or a ganja grenade) while at it, turning his office into a night club using thermal flares for lighting and strobe lights (causing a staff member to have a seizure by accident), manufacturing modified lubricants to make people slip all across the base and... personal use, and we can't forget when he rigged a puppet alien inside a test dummy for medical training, scaring the surgery room no longer sterile for the remainder of a night.