Sark/Disclaimer
Sark is...Not Normal. He isn't human, and never was. So unlike a Vampire or Werewolf or Other that might have started out Human and adapted to Ungodly Awesome Powers, Sark was hatched from an egg and views humans as fascinating to watch. He does NOT possess human morality, and tends to not have any taboos. You probably cant embarrass or shame him, but on the other hand, he's missed out on 100 years of pop culture, so be prepared for some clueless looks at times.
Sark also learned at a very young age that, if humans perceive a threat, they will attack it and try to kill it, long before someone says 'Hey, maybe we should investigate', so Sark has crafted this act of presenting himself as, well, something easily dismissed. He takes on a teenage boy's appearance because most adults dismiss teenagers as an annoyance, especially one that seems to do nothing but laze around coffee houses and parks all day. Excepting maybe one person, he does NOT show off what he can do or what he can endure...because then that information is out there and someone could use it against him.
This is not to say Sark lives a lie. He finds humans FASCINATING, and the entire reason he's stayed in this Realm and not fled to the Astral or the Umbral with most of the rest of dragonkind, is that he thinks Humans can be gently nudged away from the doom they are confidently striding towards. And OH MY they make such tasty snacks.