Mystery is a fortune-telling hamster. She is able to predict the future with her magical crystal ball. The catch is that she only predicts obvious things that the Ham-Hams already know, or she makes very vague predictions that could apply to anyone. The Ham-Hams are often suspicious of the veracity of her fortunes, but still generally go along with them anyway.
While she is shown to be a bit of a quiet type, Mystery is always very cheerful and optimistic, and she never becomes angry with anyone or anything. She is very confident with her predictions, and is always certain that they'll come true.
Mystery is never seen without her pink costume; she even wears it while sleeping. While channeling her predictions, she chants "atarinchu~" and occasionally ends her sentences with "pitarinchu~!"
Magical is Mystery's little brother and assistant. He too is very confident in his sister's predictions, and will become angry when anyone questions them. When Mystery channels her predictions, Magical does a lot of the talking for her. She may not be very talkative in general, or perhaps she is too concentrated in her fortunes to respond to most inquiries.
- In Lady Lapis!, Magical mentions waking Mystery up would be bad, which may imply she can be cranky if woken too early.
- Main article: Mystery/Gallery