Karui Doduka is the Ultimate Toxicologist. Incredibly shy and reclusive, she’s prefers peace and quiet over interaction with others, and is always trying to blend in the background. It’s very clear that she doesn’t particularly enjoy her talent, but since it’s one thing she knows she’s good at, she practices it long into the night, making her an insomniac. Meek and fragile, she suffers from low self-esteem, despite her classmate's efforts to get her to be more confident. However, that confident side does come out when she talks about her talent, as she's incredibly knowledgeable on it.

Karui's voice should be very hushed and frail. Remember, she only ever comes out of her shell if absolutely necessary, and she's never too loud when she does. She should also sound very sleepy, as often, she'll forego sleep for nights on end.