Proteus

[proh-tee-uhs, -tyoos]

noun

plural

protei 

1. Classical Mythology.,  a sea god, son of Oceanus and Tethys, noted for his ability to assume different forms and to prophesy.

2. a person or thing that readily changes appearance, character, principles, etc.

3. (lowercase),  any of several rod-shaped, aerobic bacteria of the genus Proteus, sometimes found as pathogens in the gastrointestinal and genitourinary tracts of humans.

Proteus

/ ˈprəʊtɪəs /

noun

1. Greek myth a prophetic sea god capable of changing his shape at will

Proteus

1. In classical mythology, a god who served Poseidon. Proteus could change his shape at will.

Someone or something that easily takes on several different forms may be called “protean.”