Reflector

Reflector is a Spark that appears in Mario + Rabbids Sparks of Hope. It is a plump, blue Spark that uses a mirror-like object. Its Power is Reflect, which redirects a portion of the damage taken by the player back to the enemy that damaged them. Its Bonus is Attack Master, which increases the damage output of weapon-based attacks.

Mario + Rabbids Sparks of Hope website
''When Reflector powers up, the enemies better beware! With its help, the attack aimed at the hero is directed right back at the opponent. Ouch.''