He has the same look as Ethan from the game. He doesn't have that much changes in appearances. However, he sports his own goggles.
Hailing from New Bark Town, Gold is incredibly athletic and lives in a house full of various Pokémon. As the reader becomes acquainted with Gold, one finds he's a kind-hearted but very hot-headed young man who doesn't seem to think things over well. However, when telling Emerald about getting Jirachi, he showed more of a serious personality, which is unlike of him. When he first met Bugsy, he mistook him for a female and asked him out for tea. He also asked Jasmine, the Olivine CityGym Leader out on a date once. He also touched Green's bottom, igniting Silver's anger. For some reason when he first met Crystal he did not get along with her, saying she was too serious, and when he gave her burnt food he said that the blackness of the food matches her personality. Besides being a protagonist of the manga series, he also serves as comic relief (mostly due to his flirtatious nature, his nicknaming or his habit of not recognizing several characters who are famous or he met in person before.)
Gold & Silver arc
Gold's adventure began when Joey took Gold to Prof. Elm's lab and sees Totodile being stolen by Silver. Gold used Cyndaquil to try and stop him.
Along with the new protagonists, his rivals Silver and Crystal, they fight with Red's team against Masked Man, and in the end, was able to cure Pryce, the true identity of the Masked Man, of his sadness with the help of Celebi.
After Red, Blue, Green, Yellow, and Silver are petrified into stone by the after-effects of the energy blast caused by Deoxys, Gold and Crystal re-appear in the Battle Frontier saga, where the new protagonists Emerald, Ruby, and Sapphire are battling against Guile Hideout, in hopes of achieving a goal that the current main characters are clueless about; reviving their old companions, who are statues trapped at the end of the top room of the Battle Tower. Later, they are surprised when Red said that why won't they hold a match and each and every Pokédex Holder will join, it is known that Emerald won it.
HeartGold & SoulSilver arc
Three years after the events in the Emerald arc, the story starts when Gold arrives in the Pokéathlon Dome, looking for a person with information he is supposed to meet with. The person never shows up and Gold starts investigating. The disappearance of the person in question might have something to do with the sudden recent sightings of Team Rocket. Silver, Gold and Crystal carry out investigations to see who the mastermind behind all this is. Their investigations lead them to the Sinjoh Ruins where the mastermind's plan, involving the legendary Pokémon Arceus, is unfolded. As told, Gold faced Arceus alone with all his team members but Togebo which Gold didn't want let him fight thinking he will get hurt but after believing in him, Togebo evolved into a Togetic and later into Togekiss after seeing the bond between Gold and his Togekiss. Arceus believed in humans and his anger was calmed.
Omega Ruby & Alpha Sapphire arc
He appeared in a flashback when Ultima thinking of the Pokédex holders he had taught Blast Burn.
Aibo was one of the first Pokémon to accompany Gold on his adventures. Gold also used it to cheat in pool by wrapping paper around its Poké Ball and having it roll around to win. It evolved into a Ambipom during the HGSS arc.
As a Poliwag, it was accidentally stolen by Team Rocket since they stole Gold's bag instead of Prof. Elm's bag. Polibo's Poké Ball fell out and into a river with him still in it. Poltaro evolved twice in the Bell Tower with the help of Silver trading it when it was holding a King's Rock. Much to Gold's disappointment because of wanting Polibo to be like Red's Poli.
Exbo started out as a Cyndaquil and when the Totodile was stolen by Silver, it became mad that its friend was taken and decided to go with Gold to try to get him back. Exbo evolved to a Quilava after battling the Pokémon in the daycare. It evolved to a Typhlosion while battling Lugia in Whirl Island.
Gold caught Sunbo after the mass outbreak of Sunkern near his hometown and used Sintaro to beat Skarmory. She is the reason for Togebo hatching and uses Sunny Day to power up Exbo's fire-type attacks. She evolved into a Sunflora after battling the The Masked Man.
Gold met Sudobo while in a bike race with Whitney. It was blocking the path of the race and both of them tried to get it out of the way, yet it didn't budge. After Polibo's Water Gun, it shrinks in size and Gold finds it was running from a Rhydon. Much later, Gold helped him regain his confidence and he was able to defeat it. After the battle, he decided to go along with Gold.
Togebo was given to Gold as an egg by Professor Elm's assistant, so he could hatch it. It was the offspring of Jasmine's Togetic. It hatched into a Togepi and had an interest in gambling just like Gold. During the HeartGold & SoulSilver chapter, it was revealed that Gold didn't want Togepi to get hurt so he withdrew him from battles, After Gold began to trust him, it evolved into a Togetic and later evolved into a Togekiss after using the Shiny Stone that Gold received from Lance.