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He has blond hair and wears a green shirt with a long white sleeve shirt under it, as well as long blue jeans with a black belt with a light blue circular buckle in the centre and grey and white trainers. He also has red eyes.
In Sooper Poof, Mark disguises himself as Justin again after Timmy wishes for the Fake-i-fier to be fixed.
In Fairly OddPet, Vicky says she got in a fight with him and refers to him as her boyfriend, possibly indicating that they have reconciled since the fake-i-fier incident, but are now in a rocky relationship.