Veils
Cait is able to create illusions, an inherent ability shared by all of his kind. He can use these illusions to become invisible to the naked eye, to conjure the image of people/objects/creatures, or to alter the area about him. Handy for concealing his presence/the presence of others, or for causing a chaotic distraction.
Shapeshifting
Cait's natural from is that of a black and violet striped Cheshire cat, but his shapeshifting ability allows him to change his appearance to whatever he chooses, including the cat boy form he uses for hero work. Human, animal, mineral, it doesn't matter so long as he knows what it looks like. The more intimate he is with the subject he's changing into, the more accurate the shapeshift. He's capable of taking on any gender he chooses, but more often than not he tends to stick to male gender.
Feline Agility
True to his cat heritage, Cait is very nimble no matter what form he's in. His movements are fluid, graceful, and quick. This comes in handy when he needs to dodge incoming attacks. He's also very flexible, able to twist about in midair and -- you guessed it -- land on his feet.
Feline Senses
Cait has the senses of a cat, though some of those may be dulled depending on what shape he's in. His sense of hearing is greater than that of a dog's or a human's if he's in a form where he can have his cat ears, allowing him to hear up to ultrasonic sounds. His heightened sense of smell is unchanged no matter what form he's in. His sense of touch really only applies if he's in feline form, since like any other cat, he uses his whiskers to navigate in cramped, enclosed spaces. His vision is definitely greater than that of a humans, no matter the from he's in. By dilating his pupils, he's able to get an almost panoramic view, giving him unfairly heightened peripheral vision. He also has superior night vision. About the only advantages he doesn't have comes in the form of a terrible sense of taste (he has far fewer taste buds than humans do) and the fact that he has a blind spot about 4-5 inches in front of him (so he may miss things that are right under his nose).
Spellcasting
Cait has an inherent talent for spellcasting. He has offensive, defensive, and healing spells in his arsenal, allowing him to adapt to the needs of any given situation. Smaller scale spells take little time to cast, and can be done with simple gestures. Large and more potent spells take time, focus and preparation in order to cast them successfully.