Extremely charming, hot and sassy, Nikolai Lantsov (also know as "Sobachka", later " Korol Rezni" ) is the Grand Duke of Udova and the second prince of Ravka. He has multiple personalities and often seen to step up on the rouge privateer, Strumhond's role.
The smile that a longterm crackhead/cokehead displays due to missing teeth. The remaining teeth are spaced out with the gaps from missing teeth very obvious, thus resembling a classic Jack O' Lantern carved mouth.
I once worked with a super cokehead, Andycaine, who has a Crack O' Lantern grill.