Theodore is the youngest in his older brother band. He is the only chipmunk that does not play the guitar, instead he plays the drums. When Alvin
has a plan, and Simon won't go along Alvin will trick Theodore into helping him. Theodore is not that smart and is easily tricked, his favorite color is green. Theo shares a relationship with the chipette Eleanor. Eleanor is also the youngest in the Chipette band. Theodore is really sensitive about his weight, he does not like anyone calling him "fat" or any other fat names. So Alvin and Simon have to protect him more when bullies try to beat up on their little brother. Theodore is said to be a great cook.