A hunter/stalker thing can't collect trophies? And in what way does swearing off material possessions make sense for something that probably never had material possessions in the first place?
There are over
NINE THOUSAND! one hundred homebrew disciplines. I'm certain there are several that work for a spiky, pouncy, clawy thing.
Even from the published disciplines, there's a few maneuvers that are well worth having. Bandersnatches have a low will save, so Moment of Perfect Mind is worth picking up. Iron Heart Turnoffthesun is good for anyone, as is White Raven Extraactions (if difficult to justify fluffwise.) I haven't really explored higher level options but you have access to 9th level maneuvers.
EDIT: An alternative to the MoL path could be the
Chaos classes. They'd need a little refluffing and some stuff (like power armor) wouldn't make sense, but a level each of cultist, warrior, and champion would get you a variety of pretty scary abilities.
ANOTHER EDIT: Having looked through the compendium,
Bhu's Kitteh discipline would fit pretty well for a bandersnatch.
Infernal Monster fits for a Frumious.
Star Dream is fey based.