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Chaos had chosen the ones that would accompany him not for preference though.
Abyss was part slime so she could adapt to sizes, and her hideous songstress skill could let her affect the minds of pirates and possibly knock them out without causing any disasters that could damage slaves. Also, her Space and Time Magic would come in handy, although she had yet to acquire the ability to use something as the Teleport Spell, she could use things such as Warp, a short-range teleport to move around and even skip whole obstacles.
Erebus could shapeshift his body too and was made of darkness, he could easily kill without making a commotion, was silent and composed, and obeyed his papa thoroughly.
Boxxy was yet again another shapeshifter, she could take the shape of other beings she looked, her infiltration potential was superb. She actually didn't had any gender, being a genderless being, but had taken the liking of being referred as a girl.