These are my headcannons and I might change some in the future. 

( I don't know all of the hermits personalities so please don't come after me. Also, not all of the hermits, there are only gonna be about 4 in each of the headcannon chapters.)

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Grian

-5'6

- Parrot hybrid

- Germlin of chaos

- Bottom

- Relationship with Scar

- Loves to prank 

- Soft, fluffy hair

- Passion to fly high

- Parents divorced when he was a little kid

- 0.5 of a brain cell

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Scar

- BIG HAT

- 6'6

- Top

- Relationship with Grian ( I don't know what the relationship between him and Cub is sooo Scarian.)

- Little sarcastic

- Older brother named BadTimes

- Cuddler

- 1 brain cell

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Mumbo

- 6'7

- REDSTONE

- Spoon

- Top

- Relationship with Iskall

- Scared of Grian with redstone

- lost his brain cell

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Iskall

- 6'4

- REDSTONE 

- Bottom

- Relationship with Mumbo

- Scared of small spaces

- 1 brain cell