Squidface
Squidface is a mysterious Mindflayer who has commandeered The Kraken and converted it into a pirate ship with an Undead crew.
His motives and goals, and his real name are yet unknown. He is referred to as Squidface or Squiggles.
He has considerable psionic powers and can induce vivid hallucinations, and mind control his victims. He was able to make Kylee O'Ren lose consciousness, and completely dominate Bethany Rogers.
He appears to be commanding a crew of skeletons and several wights, but it is unknown whether or not he raised those undead himself, or if he is working with a necromancer of some sort.
When he attacked the Royal Seagull he used magical mist to cover his approach. His crew was able to launch barrels filled with human remains onto the target ship, and then remotely re-animate those corpses into skeleton warriors.
He faced the Protagonists for the second time in the fishing village of Pearltown where he was able to incapacitate them, and cause them to have vivid hallucinations. The encounter also revealed that Squidface's control over his undead minions is erratic and tenuous, and that he sometimes loses control over some of them.
Since then it has been revealed that Squidface has been an accomplice of Lichard and both of them have been working together trying to bring Darius Corellius back to life. Additionally there is evidence that Squidface might be the long lost king William Helmsworth - or at least has been the king before transforming into the monstrosity that he is now.