Speedy Dave

Speedy Dave, known as Daisuke Hayami (速見ダイスケ) in Japan, is the operator of QuickMan.EXE.

Personality
Dave's most prominent quality is his love for nature, which is so extreme that he will commit acts of violence to protect it. This is his primary motive in the games and anime. But in the anime, he shows a gentler side and is kind to others, like Sal. He is also less extreme in the anime and never planned to harm anyone.

MegaMan Battle Network 2
Dave first appears in Okuden Dam, as a park ranger who is impressed when Lan Hikari cleans up the trash around the dam and park. However, he later reveals himself to be the operator of QuickMan and a member of Gospel. Dave attempts to blow up the Dam to preserve nature but is defeated by Lan and MegaMan.EXE and then Chaud and ProtoMan.EXE. He is arrested and not heard from again.

MegaMan NT Warrior
Speedy Dave was featured in an episode of the anime. He was a childhood friend of Sal's, and loved nature just as much as she did. However, he sought to protect nature so much that he joined Gospel to do it. Under the name of "Earth Avenger", he was ordered by Gospel to destroy the dam, and attempted to do so by reversing the spinning of the turbines. After QuickMan was disarmed by MegaMan,  Dave reveals that he was merely bluffing, and was only trying to scare the people in charge of the dam to take better care of nature. After MegaMan thwarts CutMan's attempt to finish the job, Dave leaves but not before saying goodbye to Sal.

Trivia

 * Speedy Dave claims to have an IQ of 179 after his defeat at the Okuden Dam.