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He has blond hair and wears a green shirt with a long white sleeve shirt under it.
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.