Blue Oak is a deuteragonist of the Red, Green & Blue, Gold, Silver & Crystal, and Emerald arcs of Pokémon Adventures. He was also a protagonist in the FireRed & LeafGreen arc. Blue is 16 years of age as of the Emerald arc and his birthday is November 22 (Sagittarius). He normally serves as a rival and friend to Red. It is revealed that Blue trained under Chuck, the gym leader of Cianwood. Therefore, he knows a lot of martial arts.
Blue's appearance has not changed much throughout the series.
In the Red, Green & Blue arc, his outfit consists of a long-sleeved violet shirt, black jeans, knee-high, brown boots and a silver pendant worn around his neck (similar to the rival character in Pokémon Red Version and Pokémon Green Version.)
In the Yellow arc, his outfit remains the same though he wears a dingy, patched-up cape with a piece of armor over the right shoulder.
In the FireRed & LeafGreen and Emerald arcs, aside from his pendant, his outfit is redesigned to fit the rival character in Pokémon FireRed and LeafGreen Version. He wears a black, short-sleeved shirt, a gray fanny pack, violet pants, and black shoes.
Though initially his eye color was brown, it changed to bright green to match his Japanese name.
He is considered quite attractive, more than Red since in one volume when his Pokémon are swapped with Red's, Red sends out his Pokémon who don't listen to Red, girls see this and crowd around him thinking he is Blue. However, they comment that 'Blue' (Red) is not as handsome as people say, much to Red's dismay. Also, in many recent and older polls he is the most popular character.
Red, Green & Blue arc
Blue makes his debut as he battles the "Phantom Pokémon". He called out Charmander to battle it. As the battle dragged on, he eventually recalled Charmander. A boy in red then reveals himself then asks him why he didn't continue the battle. Since Blue did not answer, he then called out a Poliwhirl to battle, but lost instantly. The Pokémon then fled. As the boy nursed his Poliwhirl's wounds, Blue explains that he noticed the difference in power between Charmander and the Pokémon and stopped. He then leaves the boy to his own accord.
Blue's grandfather, Professor Oak, contacted him and told him that he gave another trainer a Pokédex. Blue wondered who it was.
Blue, having already arrived at the Viridian Forest, begins training with Charmander. They had just defeated a Venomoth. He checks it in his Pokédex and realizes that he already caught one. Later, he spots a Poliwhirl and commands Charmander to attack. Suddenly, a boy (the same one from Pallet), comes out of the bushes and calls out to the injured Poliwhirl. Blue then says that he thought it was wild. The boy angrily lunged at him only for Blue to effortlessly parry him. Blue then explained that it would only a matter of time until two trainers capturing Pokémon would come across each other. Suddenly, giant footsteps could be heard. Blue then says that he had been waiting for this.
Then, a Kangaskhan appeared. Blue commanded Charmander to attack. He then explained that he would catch it and record its data in his Pokédex. The boy immediately noticed that it was a Pokédex. He then reveals to Blue that he also owns a Pokédex all he could do was laugh. Blue then explained that his grandfather said that he gave a Pokédex to another trainer and questioned why he's the new owner. When Kangaskhan was weak enough, Blue tried to catch but to no avail. As Charmander continued to attack, the boy demanded that he stop attacking. Blue just brushed him off. The boy then commanded his Poliwhirl to dowse Charmander. Blue demanded to know why he did that. The boy then ran up to the Kangaskhan and asked if her child was okay. Blue was surprised by what he just overheard.
The baby then poked her head out of the mother's pouch. It looked very sickly. The boy gave it a potion and when the baby was healed, the mother left. Blue then complained that he could have captured it and the boy responded by saying that it would not fair to battle someone at a disadvantage. As Blue began to walk away, the boy introduced himself as Red and asked for his name. He answered only to shut him up. Red then shouts that he won't lose to him and then he left.
Blue is one of the finalists. They seem to be neck in neck with Blue appearing with the upper hand. However due to the order of the Pokémon Red sent out as a last resort beforehand knowing that Blue's Pokémon are much stronger than his, Red wins. Blue's Charizard collapses due to exhaustion, a split second before Red and his team collapses as well with Blue being the only one standing.
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After Red declines the position to be the Viridian City Gym Leader, Blue takes up the position.
FireRed & LeafGreen arc
He is first shown to meet with Red in Pallet Town before he sets off to Vermilion City to board the ferry Professor Oak sent him and Red to take to the Sevii Islands. He and Red meet Green on the ship just before she loses consciousness. Initially, Blue starts to fight against Deoxys for his friend's, Green's, sake, but it later became personal when Professor Oak himself is revealed to be abducted. He, Red, and Green fight against Sird and is soon reunited with Silver and Yellow . In the end, playing his last trump card, Sird turns all five Pokédex holders, Red, Green, Blue, Yellow, and Silver to stone.
Blue and the others are freed from their stone statues thanks to Crystal, Emerald, Gold, Sapphire and Ruby. Later, he joined the fight against Guile Hideout and won with each and every Pokédex Holder helping with the ultimate moves. Later, they are surprised when Red said why they will hold a match and each Pokédex Holder will join, it is known that Emerald won it. Blue's losses and victories are unknown and it is unknown if he even participated or helped his grandfather which he does very often and cares a lot for.
X & Y arc
Blue reappears, watching Xerneas leaping in the air with the others. He says how the battle can be stopped if "Z" really exists. He had his Rhyperior protect Diantha and other people from Team Flare's attacks. Diantha joined Blue (whom he recognizes her from before as a talented trainer), who was told "X" and "Y" will awaken in Kalos, hence they need a third Legendary Pokémon to counter those two.
Blue received Charizard as a Charmander in A Glimpse of the Glow. Although he was given as a starter Pokémon, Charmander was not Blue's first Pokémon, as he already owned a Scyther. Blue tried using him against Mew but failed and withdrew his Pokémon partly due to Red accidentally catching his attention, which resulted in Poli's embarrassing defeat.
Golduck is used by Blue primarily due to its Psychic abilities, in which it can see things obscured from his eyes. It can also be used as a channel for conversation through the Pokédex. Golduck is also used as a mode of transportation by Blue.
Porygon was won by Blue at the Celadon Game Corner, but was subsequently misplaced after a run-in with Red. It was then used against Koga by Red, before being returned to Blue. Blue later used it in the fight against Agatha. In the Gold, Silver and Crystal chapter, Porygon was revealed to have evolved into a Porygon2, fighting against Silver's Sneasel.
Machamp was originally a Machoke, and was accidentally transferred to Red's party after a mix-up, whereupon it evolved due to the trade. Machamp is shown to be incredibly powerful, able to hold its own against Red's Snor.
In Chapter 18 "A Tale of Ninetales" Pidgeot was revealed to be a member of Blue's Team. Blue primarily uses Pidgeot to send messages. He used Pidgeot in the qualifying rounds of the Pokemon League tournament and in his battle with his master, Chuck at the Pokemon League.
Rhydon was initially captured by Blue in Viridian City, and he used it as one of his main Pokémon. However, he gifted the Pokémon to Silver in order to make up for the absence of his Ursaring, whereupon it evolved into Rhyperior. Between HeartGold & SouSilver and X & Y arcs, it was given back to Blue.
Ninetales first appeared in Chapter 18 "A Tale of Ninetales". Ninetales took out Red's Poliwrath and Pikachu during their battle at the Pokémon League. He later uses Ninetales to battle Agatha's Gengar.
Arcanine first appeared in Chapter 116 "Rock, Paper... Scizor". It was one of 4 pokemon that attacked Viridian City during Red's Gym Leader Qualification Exam. Blue defeated it with Scizor and then caught it. Arcanine was used in Blue's battle with his master, Chuck.
Alakazam first appeared in Chapter 116 "Rock, Paper... Scizor". It was one of 4 Pokémon that attacked Viridian City during Red's Gym Leader Qualification Exam. Blue defeated it with Scizor and then caught it. Alakazam was used in Blue's battle with his master, Chuck.
Exeggutor first appeared in Chapter 116 "Rock, Paper... Scizor". It was one of 4 Pokémon that attacked Viridian City during Red's Gym Leader Qualification Exam. Blue defeated it with Scizor and then caught it. Exeggutor was used in Blue's battle with his master, Chuck.
Lapras first appeared in a flashback in Chapter 50 "Lapras Lazily". The Lapras attacks Blue while he is surfing on his Golduck. He battles and catches Lapras. He later gives Lapras to Evan after Blue helps him get his Haunter back from Agatha.