<P> Theodore is the child of innocence and the youngest of the Chipmunks . He is shy, loving, sensitive, chubby, gullible, trusting, and naïve . In short, he is an easy target for Alvin's manipulations . He wears green attire and has green eyes (brown in the CGI animated series). Theodore often holds the swing vote between his two brothers' choices of action: Simon appeals to Theodore's better nature while Alvin goes straight to bribery . He has a big appetite, constantly craving snacks and in one episode, Theodore tried to eat Alvin's hand because of his hunger . He plays the drums, the guitar, and other instruments . In vocal harmonies, his voice is typically the highest . He is fragile yet unpredictable and not very brave, but he will put on a brave face when his brothers are in trouble . At times, he is childish and Alvin's follower, but he is also the glue that binds his brothers despite Alvin and Simon's differences and regular disagreements . Although he is sometimes teased by Alvin, Theodore loves his big brother and knows that Alvin loves him too . </P> <P> He seems to have affection for Eleanor, who shares physical traits with him, but she is smarter, braver and more athletic . They each have a passion for cooking, as Theodore is seen baking Christmas cookies in some Christmas episodes . In the live action / animated films, it is revealed that Theodore is sensitive about his weight and is often hurt when he is criticized for his chubby physique . This also applies to Eleanor, but she is able to stand for herself and wishes that Theodore would do the same . </P> <P> Like his brothers, he was originally voiced by Ross Bagdasarian Sr. In the animated series and film, his voice was provided by Janice Karman, Ross Bagdasarian Jr.'s wife and the voice of all three Chipettes . Jesse McCartney voiced Theodore in the live - action / animated film series . </P> <P> Brittany is the lead singer and leader of The Chipettes and is the female counterpart of Alvin . She wears pink attire and has red hair often drawn up in a ponytail and has blue eyes . Brittany is considerably beautiful, self - centered, ambitious, and vain, but she does have a kind side and is loyal to her sisters, Jeanette and Eleanor . Brittany is often trying to look pretty and desires to make herself popular or get what she wants, but she does learn her lessons and is willing to do the right thing . Brittany often displays affection for Alvin as they are alike in many ways . Although she and Alvin are often quarrelsome with each other and often compete over who is the better, she does stick by his side in tough situations and deep down, she and Alvin do love each other . Brittany pushes Jeanette around a lot and takes advantage of her kindness, but deep down, they love each other very much and care about each other, proving that Brittany does have a gentle side . Eleanor always stands up to Brittany when she tries to push Jeanette around, but they do share a strong sisterly relationship . </P>

Who voiced theodore in alvin and the chipmunks