For those wondering, Sagume's ability is essentially to jinx things. Apparently it only works when she doesn't want it to.
I don't think it can be described as a jinx, the reverse of what she says will happen. Therefore she's very careful in what she says and is usually quiet because of this.
Abilities
Reversing a situation with her words
She can use her ability as well, just has to be very careful with it. She'll prob be paired with seija a good bit, surprised there isn't more as of yet.