Translation of "Prickly" in Japanese

For all its destructive powers, this prickly little predator does serve an important purpose.

この小さな破壊者も 重要な役割を持っています

Could it be that her prickly attitude is just because she has period pains? No, couldn't be.

もしかしてツンツンしているのは、生理痛なだけとか？いや、まさかね。