Hydra

Hydra is Pluto's fifth moon and truly a trio of terrible.

Personality
Hydra as a whole has dissociative identity disorder, a mental disorder where someone has two or more personalities besides one. This is often characterized by sudden changes in activities, speaking, and memory gaps from events. A more hyperbole-like version of DID can be found in the movie Split, where the main "Split" character has 23 different personalities.

Due to Hydra in mythology being a three headed dragon at it's basis, it has therefore 3 personalities:

Personality 1
Personality 1 consists of an intellectual-like course of actions, including the reading of books or involvement in the fields. This is also contradicted by a more sadistic way of saying things, including dark metaphors among other things.

Personality 2
Personality 2 consists of an intentionally idiotic state of mind, where Hydra is able to easily forget memories within minutes and recite words in horrendous ways. Hydra uses Personality 2 in an attempt to erase bad memories, though via Personality 1 Hydra always remembers them. The main contradiction of Personality 2 is a sudden interest in religion.

Personality 3
Personality 3 is Hydra's main personality. Characterized by a monotone form of speaking and partaking in little to no actions, this version of Hydra is often introverted and refuses to speak alot. Hydra in this state is the only personality to be aware of their other two, and often attempts to pray to stop this issue. There is no main contradiction, though it's usually the sudden switching of personalities.

Appearance
Despite the personality stuff that happened above, Hydra mainly remains in one outfit, which is a basic sleeved white T-shirt and contradicting glove colors; the left hand has gray, the right hand has black. The pants also follow the gray-black, but not the always-dark shoes.

Should Hydra change, a main theme in their choice of clothing is the recurring motif of triple colors, the number 3, or anything that relates with "3" of something.

House Appearance
Hydra does not have a house, as trying to get one would be the hardest thing to do considering their painful disorder. Instead, they opt to live in a wall, where they are easily comfortable with switching personality.