Mr. Trick arrived with Kakistos in Faith, Hope and Trick. He was very modern, fast talking, witty vampire who understood and embraced computer technology.

Check it out. This town, this very street, is wired for fiber optics. We jack in a T-4, hundred megs per, we got the whole world at our fingertips.

Mr. Trick - Faith, Hope and Trick

Despite his intelligence and wit, Trick was one of those vampires who are followers rather than leaders. He did have enough sense though to realise that Kakistos was going to be beaten and got out while the going was good.
He quickly found a new employer, the Mayor who spotted him whilst he had organised "Slayerfest '98" in 'Homecoming.' This was typical of Trick who didn't seem to like to get involved in the violence himself, unless he had to. Another example of this is 'Band Candy' where he sub-contracted to Ethan Rayne.
Interestingly Mr. Trick was one of the few vampires who when staked had time to say something before he turned to dust.

Oh, this is no good. This is no good at all.
Consequences

Nothing is known of Mr. Trick before he was a vampire but perhaps he worked for a fast food chain. He certainly enjoyed eating their employees.

He was quickly recruited by the Mayor to work for his team and was the head of the Mayor's security team for several episodes before he was staked by Faith.