ulik is nothing new to someone like herc, and while ulik has on occasion given thor some trouble, thor has also easily beaten him down and would do so without effort if he didn't brawl. ulik def loses almost every time imo after doing well in most of the fights. herc has some really good durability showings--more than enough to have him beating ulik for sure.
thor has easily handled skurge as well, and his axe has always performed better in OTHER people's hands. herc is more skilled, stronger and has better durability than skurge does, so minus some really exotic weapon use (something i'd need to see him doing several times), herc would handle skurge more easily than he has handled ares.
the magician's have too many options. like i said. in the same way they would beat any essentially one-dimensional character.
the serpent would also win. like i said. you'd think a serpent capable of crushing a planet could out-muscle thor too, but...not how it's gone when they fight. lack of mobility would be the difference though. no way herc could dodge and avoid strikes the way thor could. minus a massive lightning strike, (that may or may not be enough to put it down) the serpent would destroy unworthy thor just as easily. if the magician's fight smart, they would also beat down unworthy thor like they would herc.