I've met 2 duals that I know of...I dunno what constitutes "perfection" but, uh, they aren't that, but they're ok.

One of them is my bfs dad and he talks a ton, so I guess that's a "flaw" even if it doesn't bother me.

The other is a coworker who kind of avoids me for some reason which is maybe a sign of some kind but I'm ok with it since I hate small talk. He takes time at the end of staff meetings to give everyone financial and tax advice and if that isn't LIE and adorable, good grief.