There are several things that are immediately noticeable about the overly-anxious individual known as Nik, Nicholai, or Mavic--both in terms of appearance and otherwise. He is a somewhat diminutive figure, short in stature and almost unhealthily thin (albeit surprisingly leanly muscled). This well-meaning Belarusian demon could be simply be described physically as a Tim Burton character with a shit-ton of freckles and an always-ready heart-warming smile.
Nik, as a rather lonely person, greatly enjoys the company of close friends and other people but has a bad habit of overthinking social interaction a lot of the time and does seem to have an allotment of trust issues. Even if he is not the best at socializing, he does like being around other people, at least, and almost all of the jobs he has (a barista, a waiter, and a journalist); even so, Nicholai greatly prefers the company of a few close friends and loved ones rather than a sea of complete strangers.