In one of early chapters my MC gains the power to make people sleep. Which sounds pretty useful for a thief, though she uses it mostly to get out of conversations she doesn't want to have. On a downside, she starts hearing voices at night and cannot sleep herself. And, spoiler alert, it turns out that her gaining those powers have some additional serious side effects.
As for other characters, there are two that can pull out an illness from any living being, but also make any other being sick. There's also a water mage, though he doesn't use his powers much, it mostly shows as rain when he is sad. There are two characters who claim to have powers but it hasn't been confirmed yet if they really do- one can catch a soul of a dying person and place it into another body, and the other one cannot die until his 20th birthday.
Other than that, there are several characters that are good at swordfighting, and there are dragons who can shapeshift, fly and breath fire.