Tristan Trang is the Mastodon Jurassic Ranger and later the Parasaurolophus Jurassic Ranger portrayed by Samuel Patrick Chu.
"A reserved teen who is subjected to his parents strict traditional parenting, whose constant studying and well mannered behavior has helped to label him the "Perfect Son". But looks can be deceiving underneath his calm exterior is a silver-tongued and opinionated with a bit of gambling habit and is known in the area for being the most reliable bookie."
After a getting into trouble over the summer his parents have made get a job to pay off his gambling debts and making him babysit his younger sister as punishment.