Forum:PB is still, and has always been a servant of the Lich

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 Spoilers Below 

The Lich was entrapped in the Palace's tree from before Princess Bubblegum, durring the rein of Princess Cottoncandy.

Meaning he has been able to twist her slowly since her birth, unless she had the crown placed on her head as she was born, however, even if that were the case, we have seen in his first appearence that he can still break though somewhat through the crowns power, as he breifly invisions himself to her.

Supporting this fact, is that she somehow has large amounts of knowlage of the Lich, Billy, Sciance, and Neccromancy.

She also was the one who sent Finn to retrieve the Enchiridion, and has been working on a de-corpse serum, that brings beings back to life from the dead as zombies, she later in the first episode "completes" it, resulting in the serum reviving them completely and non-zombified, how ever shes testing the zombie flesh again for unknown reasons, and creates a new wave of zombies by accident.

It is also possible that this is a long thought out plan by the Lich, Feigning his defeat at the hand of Billy, so he could corrupt the closest Kingdom to his pool of power and birth place, to what effect this may have, is unkown, prehaps to wait out Billy, as he may be some threat, untill he is old and weak.

Being that he destroyed Billy's power glove with trivial ease, and later slayed Billy himself, and wore his skin as a disguise to trick Finn.

The corruption of the people of the candy kingdom.

While it is possible that Princess PB is merely smart, and a helpless pawn in The Lich King's plan.

If she is not evil, she has atleast two evil members in her kingdom.

Peppermint Butler

Peppermint Butler has exeding knowlage of the Darkarts, and seems to know both Death, and Hunson Abadeer very closely.

His closeness with Death, provides Finn and Jake exaulted treatment in the land of the dead by Death himself, at the mere mention of his name.

A picture in Abadeer's home in the Nightosphere can be seen of him and Peppermint Butler playing a round of golf.

He also was objective of allowing Finn and Jake to see his aura, using PB's aura scanning and visualisation device.

Cinnamon Bun

Cinnamon bun has no obvious trates of evil, how ever, it was his "carelessness" that played a part in the spreading of the seccond wave of Zombies in the Episode "From bad to worse".

He also is breifly seen falling in to the pool from which Goliad was formed, possibly being the reason why Goliad was so easily tuned to a dark, controlling, and evil personality.

Cinnamon Bun somehow marraciously survive the trial of delivering the Tarts in "The other tarts", despite the various dangers, that not even Finn and Jake could over come.