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Theodore is the tritagonist of the series and films. He is the youngest of the group and is best described as shy, loving, sensitive, gullible, trusting, naïve and innocent.
In The Alvin Show, Theodore was commonly known for his giggling when he and his brothers were being mischievous.
Theodore is a character that has a great interest in eating and cooking in the 1980’s and 1990’s television series. He is considered innocent and gullible and is portrayed to be the youngest. Theodore is often seen with a teddy bear in some episodes as well as Alvin and the Chipmunks Meet Frankenstein and Alvin and the Chipmunks Meet the Wolfman. Theodore's love for cooking is often seen in episodes such as Father's Day Muffins and Every Chipmunk Tells A Story. He is found to care deeply about his self-image trying on numerous occasions to attempt to become more fit or at the very least, trying to lose weight as seen in The Picture of Health and The Brunch Club.
Theodore is a chipmunk who helps out his brothers in their time of need. His instrument is the drum. His signature color is green. He is very gullible and innocent, always letting Alvin get to him with his schemes. He is shown to have nightmares (as well as frequent fears such as eagles and jungle monsters) and often sleeps with Dave in one of the first two films. He is shown in Alvin and the Chipmunks: The Squeakquel to be somewhat sensitive about his weight when the bullies poked his belly and butt and called him fat, even saying that he has "serious junk in the trunk." Alvin and Simon claw them up as a result, taking care and watching after their baby brother. He has a crush on Eleanor Miller, one of The Chipettes who has similar traits of Theodore, who shares his same interest, but not as gullible and she returns his feelings, but feels that he should stand up for himself more.
Theodore retains his gullible and innocent nature, but loses the sensibility over his weight as seen in the CGI films that was unlike him in the 80s. He still loves to cook and eat. He is seen more as the younger sibling that is either taken advantage of or ignored. In the series, Theodore is seen multiple times with a teddy bear to keep him company (Talking Teddy and Lil'T) and is terrified of clowns (Clowning Around).
Theodore is commonly seen wearing a dark green top. He is the shortest chipmunk, about the same height as Eleanor, in all films and series except The Alvin Show in which he is taller than Alvin but shorter than Simon.
Before The Alvin Show, Theodore wore a pink vest with a "T" in it. After The Alvin Show was created, he wears a green sweater and black shoes.
In the Alvin and the Chipmunks series, Theodore wears a green sweater, and a pair of white and blue pattered shoes.
Theodore in the CGI/live-action films only wears a green hoodie. His appearance was modified to look more closely to a real life chipmunk.
In ALVINNN!!! and The Chipmunks, Theodore wears a green zipped-hoodie which has a lighter shade of green on the hood, light blue jeans that are folded at the bottom, and green and cream colored shoes. He also has brown eyes and dark yellow or light brown fur.
Theodore and Dave are extremely close. Theodore loves making things for Dave. For example, Theodore made a Get Well card for Dave when he was in the hospital in Alvin and the Chipmunks: The Squeakquel and he made a necklace for Dave in Alvin and the Chipmunks: Chipwrecked. Dave loves the necklace that Theodore made for him and Theodore loves seeing his adoptive father happy.
Theodore loves Alvin because he is his brother. However, Theodore gets upset with Alvin sometimes.
Theodore can always count on Simon to look after him. Theodore stays close to Simon, because he knows his brother will protect him, because they love each other.
Theodore and Eleanor are the most open about their relationship. They spend lots of time together and enjoy each others company. Theodore has given Eleanor a necklace. They are shown to be married as adults.
Theodore and Jeanette are friends, but they don't interact very often. In Jeanette Enchanted, Theodore extended her "magical powers" just to maker her happier longer.
Theodore and Brittany are friends, but they do not interact very often. She seems to care about Theodore such as in Dragon Dad when she didn't want to take the dragon egg from Theodore but did so not wanting him to be upset when it failed to hatch.
|Theodore: Since when did Alvin feel like playing Around The World In 30 Days? - (The Chipmunk Adventure)|
|Theodore: I'll have two cheese enchiladas with extra sauce, a tostada grande, the quesadilla with a side of guacamole, two chillis with... - (The Chipmunk Adventure)|
|Theodore: And one quesa...dilla. - (The Chipmunk Adventure)|
|Theodore: Natasha! Natasha! Daddy's gone!! - (Meet Frankenstein)|
|Theodore: The ants in France stay mainly in my pants. - (Meet Frankenstein)|
|Theodore: Guys! I think he made it angry! - (Alvin and the Chipmunks)|
|Theodore: But...we talk. - (Alvin and the Chipmunks)|
|Theodore: I thought my heart was gonna explode! - (Alvin and the Chipmunks)|
|Theodore: Hi, I'm Theodore. - (The Squeakquel)|
|Theodore: She's like a beautiful, green gumdrop. - (The Squeakquel)|
|Theodore: Please don't eat my brain! - (Chipwrecked)|
- The origin of his name comes from Theodore Keep.
- In the 1960s The Alvin Show, Theodore was known for being the one who giggles. This changes into the 1980's for being the one who cooks. Theodore's character traits changed one more time for the modern CGI/live-action films to be the "fat" and sensitive chipmunk.