Evil tibbits, particularly chaotic evil ones, are rare but dangerous. They use their shapeshifting ability to spy on humanoids for information useful for extortion schemes. Many of them work as spies and assassins, as their innocent, feline form makes it easy for them to slip into even heavily guarded areas. After all, even the most alert guard pays little mind to a cat. Some evil tibbits become powerful crime lords, observing their underlings and competitors in cat form and ruthlessly culling those who plot against them.
Strangers and business partners use the name a tibbit picks for herself, while the tibbit's close friends and family use the original nickname chosen by her parents.
A tibbit allows only her closest friends to learn and use her nickname. A nontibbit given such a privilege has received one of the highest honors a tibbit can grant to an outsider.