Blue

Blue is Machine's rival and has been ever since they both attended the Red Star Academy. Blue is originally from Pallet Town. His father, Professor Oak, was killed by Team Rocket but Blue acted as if he didn't care. After the events of Team Rocket's attack took place, Blue went back to the Pokemon League a year later and became the new Pokemon Champion after defeating all the Elite Four there.

Biography
Blue is a mystery to everyone and he treats others like trash whenever he gets the chance. However, according to a few instances in Pokemon: Red Star, Blue has acted beyond his normal standing. Several times in the story, he has treated the rest the Pokedex Holders as if they were his equals even though, he believes Red and Machine are the strongest within the group. Blue, although at first thought to be a heartless person, seems to enjoy the company of them, even though, he may still at times not admit it. Despite coming off rash and deliberate, Blue is actually a nice person and this has been shown through his Pokemon and how well he trains and treats them.

Another instance shown in Blue's developmental process was when Machine was thought to have been killed by an explosion created through his reckless charging into a Dragonite's Hyper Beam to try and deflect the attack. This worked, however, afterwards, everyone there, including were crushed and felt horrible about what happened. In fact, without even consciously realizing it until later, Blue comforted Yellow after she broke down, onto her knees in tears from the loss of her most cherised and beloved one.