Jamie O Johanssen is a fictional character in the Hey Arnold! TV Series.
Jamie O is Gerald and Timberly's older brother; his age isn't mentioned, but he's old enough to drive a car, so presumably he's in high school. Whatever school he's in, he's on the wrestling team ("Gerald Moves Out").
Jamie O is allergic to flowers ("Jamie O in Love"), and he drives a blue Pontiac Trans Am with white racing strips that he is often seen working on. He is shown to be into weightlifting and is very serious about his diet, at one point eating nothing but protein bars and raw meat. He bullies Gerald and is seen taking his stuff, such as when Gerald had a crush on Chloe. Jamie O acts immaturely, always taking Gerald's food and gives him noogies. However, Jamie O does seem to ultimately care for Gerald. When he discovers that Chloe is only using Gerald to get to him, he gets very upset and attempts to tell Gerald about it ("Gerald vs. Jamie O").
- (To his Brother about Chloe) But I'm telling you the truth.
- What are you talking about? You're in junior High.
- Cherice’s cashmere sock!
- Cherice! (sobbing) She told me she’d kill me if I wrecked this sock.
- 13b. Gerald Comes Over
- 34b. Gerald Moves Out
- 38a. Eating Contest (no lines)
- 51a. Phoebe Takes the Fall (in audience)
- 64b. Jamie O in Love
- 77b. Mr. Green Runs (no lines)
- 88b. Gerald vs. Jamie O
- Hey Arnold! The Movie (no lines)
- Hey Arnold! The Jungle Movie (cameo)
- In his first two appearances he was voiced by an actual teenager (Ben Aaron Hoag) before being replaced by an adult (Phil LaMarr).
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