Firefly

Overview
Fireflies are small and seemingly insignificant creatures that don't appear to have much purpose in the world, but these tiny insects can be truly remarkable. With such tiny bodies, they can easily be summoned by the hundreds with hardly a fraction of the summoner's chakra suffering, but they are versatile in many ways other than for use in battle. They don't appear intimidating or threatening, but this allows them to remain close to enemies for tracking purposes and never be noticed, yet can emit a shock powerful enough to a pressure point that can render the one they are following unconscious, but nothing more.

Their incessant flashing can alert other fireflies that may not be the summoner's and communicate with them via flashing their lower abdominal portion. This allows them to tell information regarding their summoner and have these unknown fireflies return to the user. Communication with their own kind isn't their only unique skill, for they can also "talk" with their summoner through the various flashing patterns they emit, but someone can't learn this language overnight.

Swarm
The several hundreds at a time that can be summoned are able to heavily swarm the opponent and blind them with bright flashes. Although their lights are only 1/40 the brightness of a candle, a multitude of them can temporarily blind someone.

Numbing
During a swarm, they can also attach themselves to this person and repeatedly deliver numbing shocks to their extremities, which can cause them to have trouble moving and attacking.