He is so tall and
unpredictable. Very extroverted and
introverted at the same time. You can rely on him, but it depends on his day, if he is enough energized to help you, mostly not.
Has some specialty on his body (we are speaking about long hair for example, not that gigantic snake that he has between his legs and wants to punish you with him).
He makes you laugh even in your worsts periods of your live.
I would add that the one I currently know for ages is very hyperactive or
extremely tired, nothing between.