Apollinarianism: Avatar
The divine mind dwells in a human body but without a human mind.

Nestorianism: Venom
A union of two persons.

Eutychianism: Spiderman
Two natures fused into one nature.

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Suggested by Thomas G.:

Ebionism: Batman
Might be mistaken for a superhero but really just a regular dude.

Docetism: Superman
Appears to be human but isn’t.

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Suggested by Luke W.:

Adoptionism: Sam Wilson as Captain America – Appointed the title, equipment, and role but is not Captain America by nature and is not equal in power or status to Steve Rogers, the true Captain America who appointed him.

Modalism: Nightwing – The second of three superhero roles taken on by the single person Dick Grayson (Robin, Nightwing, and Batman) at various stages and situations in Gotham’s redemptive history.