Scuttlest

Scuttles are insect-like viruses that appear in the MegaMan Battle Network series.

Scuttle
Blue body. Aqua aura. 100 damage aura (except BN1). Attacks by either launching aqua towers (BN1) or pushing ice blocks straight ahead (NT, BN2, BN3 ).

Scutz
 Red body. Heat aura. 100 damage aura (except BN1). Attacks by firing either fire balls (BN1, NT, BN2) or streams of fire pillars ( BN3 ).

Scuttler
 Yellow body. Elec aura. 100 damage aura (except BN1). Attacks by either launching homing thunder balls  (BN1, NT, BN2) or dropping lightning bolts from above their targets ( BN3 ).

Scutzer
 Green body. Wood aura. 100 damage aura (except BN1). Attacks by either using wood towers  (BN1, NT, BN2 ) or raising vines below its target's feet, trying to capture and drain the target's energy ( BN3).

Scuttlest
 White body. Life aura. 200 damage aura. Attacks by firing a large laser straight ahead.

ScuttleΩ
 Black body. Life aura. 200 damage aura. Attacks by firing a large laser straight ahead.

Mega Man Battle Network
In the first game, the first four were only found with the Life Virus, the final boss of the game. They emerged from holes in the front row of their grid (also preventing any changes to that column), attempting to line themselves up with MegaMan and attack with the element corresponding to their color.

Mega Man Network Transmission
In this game, the first four all appear in the Undernet. Their attacks were somewhat changed, with the Scutz shooting off fire bombs and the Scuttles launching ice blocks, and they now have Life Auras like their master. They were also finally named in this game. There is also a new version called the Scuttlest that has an enhanced Life Aura that is even stronger then the Life Virus' aura.

Mega Man Battle Network 2
In the second game, Scuttles made appearances once more. They were found in the secret area, armed with auras and dangerous elemental attacks.

Mega Man Battle Network 3
Much like the previous game, they were found in the secret area.

These viruses also, amazingly, have their own Virus Chip. Their attacks are pretty much the same, but the Scutz' attack homes in on enemies automatically, the Scuttler launches bolts that hit enemies simultaneously, and the Scutzer's vines attack from below, like PlantMan.EXE, only hitting once in the initial strike but doing tremendous damage when doing so. The "Boss", a ScuttleΩ, can be found in a hidden jack-in in Wily's Castle. Right as you get off the boat, go towards the opening in the wall and Jack-In. Its in one of the corners. BEWARE: This is probably the hardest Virus Boss fight in the game! But the payoff is worth it- it does twice as much damage as the Scuttlest's laser, doing a whopping 200 damage.