Bretta

Bretta is a beetle found in Fungal Wastes, sitting alone in the dark, muttering to herself. After talking to her, she'll head back to Dirtmouth, unlocking her house and a Mask Shard.

She can be found in her house sleeping among, or occasionally sitting on the Bench. She has a massive crush on The Knight for rescuing her, and should the Knight sit next to her for a while, she'll blush.

She has several drawings and dolls of the Knight in her house, along with a diary where she writes about her "saviour". If Zote is saved and defeated in the Colosseum of Fools, Zote will show up in Dirtmouth and Bretta will fall in love with him, after which her home will no longer have dolls and drawings of the Knight but will have one single painting of Zote instead.

If both Zote and Bretta are in Dirtmouth, a new room will open up in her room, leading to a statue of Zote, that, when Dream Nailed, transfers the Knight to a dream where they can fight Grey Prince Zote.

Once Grey Prince Zote has been defeated 4 times or more, she leaves without farewell according to Elderbug. The reason for this is given in her diary; she thought of the Knight as merely a beast, and she saw Zote as being diminished. She realized that she would not meet her life’s companion if she sat idle. Elderbug also notes that she ran off over the Howling Cliffs, though she can not be found in this area.

Location
Betta can initially be found in the southeast part of Mantis Village, past the statue of the Dash Master. She can be reached by continuing west in this area and subsequently completing a minor platforming challenge.

Trivia

 * Bretta is referred to earlier in the game's development as "Bertha".
 * Bretta is one of the two bugs in the game to stop The Infection from overcoming themselves, the other being Sly.

Bretta Бретта