Orange tabbies aren't associated with a specific temperament, as they aren't a breed but a color. Lots of different breeds as well as domestic longhairs and shorthairs (probably what the boy you're looking at is, since he's up for adoption and not from a breeder) can be orange tabbies and of course their personalities can be all over the place. Look at what your specific boy is like, not what any other orange tabby is like, because there's no rules.
That being said, I can't say I've ever met an orange tabby who wasn't just a big goofy sweetheart
That being said, I can't say I've ever met an orange tabby who wasn't just a big goofy sweetheart