PROMPT: Fictional Animal

Daily writing prompt
If you could pick any fictional animal to be your lifelong companion (like a Pokémon or fantasy pet), what would it be?

None of the fictional animals I’m aware of (e.g. Dragons, Minotaur, Hydras, Werewolves, Fu-Lions, etc.) would make good “lifelong companions” as they would not be conducive to a life that was long. Perhaps the kind of foxes one sees in Chinese and Japanese folklore, though those relationships also usually end poorly (not to mention being weirdly sexual.)

Witch & Skeleton [Free Verse / Senryū]

Takiyasha the Witch and the Skeleton Spectre; Utagawa Kuniyoshi (1844)
PREMISE:
Princess Takiyasha
 summoned a skeleton to
  kill a samurai.

MORAL?:
"Don't bring swords
 to a giant skeleton-ghost 
  fight!"

CONCLUSION:
Yet, in settled dust,
 the world was less one
  Princess-witch.