shadowdice
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One of the types of Eidolon you can have is the bond of the Shadow, which is facing your "Shadow" and using that to form your eidolon. You can also have your Eidolon have the fiend subtype.
Mutations in the version we noted include claws, the ability to wield weapons, and shooting spines. There is also a form evolution that lets you have a humanoid eidolon also count as a quadruped.
So you can easily fluff it as having Demon King Nobunaga with either clawed armor or swords, while making it so the spines are fluffed as him shooting a person or having bits of his armor shoot out and stab people. The quadruped/centaurian evolution can be fluffed as him being on his horse as well.