• "Cracks" on his body are random and don't need to be drawn in any specific place or way. They intensify during times of extreme emotion. Halcyon can display different patterns, symbols, text, etc. if he focuses on himself, which he almost never does.
• He does have two horns, though only one is usually visible. 
• The halos on his body (one head, two per limb, 3 on tail) can wrap around his skin when under clothes or when he's asleep. In times of extreme emotion, spikes can sprout from the halos and from his body itself.
• Usually has a neutral expression. 

Outside of his "hero" work, the best way to describe Halcyon is a homebody. He enjoys being alone, tending to his garden, making sculptures of the grandeur he wishes he could leave behind, and reading. His perfect time of day is a quiet Sunday evening with a nice cup of tea, curled up in a reading nook learning about far off places.

Not to say he really dislikes "hero" work - he enjoys the work itself - but the spotlight is a very lonely place. and Halcyon doesn't like to entertain all of the celebrity that comes with it. After one of his appearances he always tries to sneak away from the cameras and fans as quickly as possible.

To his close friends and family, "Hal" is a very lovable and generous person, always willing to lend a hand wherever help is needed. He loves to listen to others and mediate conflict, as it drives his desire to make sure the world is a just place. However, he suffers from quite a lot of anxiety due to the weight of his role on his shoulders, which he doesn't have great coping mechanisms for. Even in places where it'd be easy or acceptable to do so, Hal doesn't have an easy time turning off his neutrality.