Brock's most notable feature about his appearance is that his eyes naturally appear closed. The rare times we see them open are when they are forced open unnaturally: from a hit with Charmander's Flamethrower in The Ninja Poké-Showdown, when being hit in the back of the head by Arbok's tail in Who Gets to Keep Togepi?, and when he makes a face for Larvitar in A Crowning Achievement. He also has tan skin, notably darker than the skin of any other major character in the series. Because of these traits, there is a heated debate about what race Brock is, as many think he may be black, Latino, or Asian. Not counting temporary outfits, he has worn three different outfits over the span of the anime, all of which have had the colors orange, green, and brown in them.
Brock is considered the most mature, wise and level-headed of the main characters, and though he does not have all the text-book knowledge memorized that Max does, he is debatably the most intelligent character as well. He often acts as an older brother and caretaker to the other characters and a voice of reason in disputes. He will usually place others before him and will help and support his friends even if it goes against his better judgement. He can understand the situations and strategies in any Pokémon battle, and often explains them to the other characters.
Brock always carries books and maps with him, and thus is usually the character who knows where the group is headed and what they can do when they get there, though starting with Advanced Generation this role was mostly taken over by the PokéNav. He also carries a lot of other supplies, such as potions and cookware; in The School of Hard Knocks, the unnaturally large capacity of his bag was demonstrated, as he pulled out a table and full tea set out of his backpack. He is a domestic, and grooms not only his Pokémon but also those of his friends with whom he travels. He handles all the cooking and the cleaning, due to both his experience and talent with it and the fact that other characters show little to no ability in those areas.
Despite this, all his maturity and rationality leaves him completely at the sight of a beautiful woman, as he falls in love with every pretty girl he meets. Brock has a desperate need for female companionship which grows worse as he continuously fails to gain it. He will do anything and everything he thinks will impress women, which inevitably ends with his heart being broken every time. A few women have shown interest in him as well, such as Erika, Wilhemina and Lucy, but most either do not notice or care about him or are scared away by his forwardness. No matter how many times he is disappointed, though, Brock remains optimistic that he will one day find a girl to start a relationship with, and has indicated several times he would stop traveling with Ash and stay with the girl if this happened.
He had a peculiar childhood and family life. His father, Flint, left home to become a great trainer. When he never returned, his mother, Lola, left them as well, leaving Brock to take care of his siblings by himself (though the English version of Showdown in Pewter City has Flint claim she died, and some speculate he was lying). However, Flint eventually returned home considering himself a failure, and instead of returning to his family he donned a disguise and sold rocks as souvenirs at the edge of town. After Brock awarded Ash the Boulderbadge, Flint came forward and confessed who he was. Flint took on the responsibilities of the Pewter Gym and his family, leaving Brock free to journey with Ash and Misty.
Brock only became the Gym Leader because he felt it was his responsibility, and he admitted to Ash that he would rather care for Pokémon than battle them. It is his dream to become a great breeder, and when Flint took back control of the Gym, Brock was allowed to start following this dream. Most notably, he took care of a Vulpix that belonged to a breeder named Susie. Shortly before Vulpix was returned, Brock used it in a Pokémon beauty contest.
Brock briefly left the show during the Orange Islands saga to work for Professor Ivy on Valencia Island and so is only seen in a couple of cameos in the second movie. While there, something happened that will probably remain secret as Brock will only huddle and say "that name" whenever he is asked about it. (Brock does mention his work for her in Destiny Deoxys, though this line was added in the dub.) After this incident, Brock returned to Kanto where he was found by Delia Ketchum, who helped him to regain his strength. Brock then became a rival to Mimey until he rejoined Ash and Misty as the three traveled to Johto.
Upon his return home after journeying through Johto, Brock was dismayed to find that his mother had returned and commandeered the gym, turning the Rock-type haven into a brightly decorated Water-type den. Brock battled her for the honor of Rock-types and won, promising his brother Forest that he would become Gym Leader someday.
After that, Brock continued to follow Ash through Hoenn, along with their new friends May and Max, and then through Kanto again as Ash took on the Battle Frontier. He left extremely briefly when the Advanced Generation dissolved to visit his home, and is now traveling with Ash and Dawn in Sinnoh.
Brock is among the longest-lived main characters in the anime, only being absent from the Orange Islands season and thus ranked under only the permanent characters of Ash, Pikachu, Jessie, James, and Meowth. Because of this, some fans believe he is too worn-out as a character and should be removed from the cast as soon as possible. Others believe he has established himself as a permanent character, and do not see him being removed from the cast any time in the near future.
This listing is of Brock's Pokémon as of the most recent Japanese episode.
Vulpix (he said, however, that he never considered Vulpix his own, and that he was only raising it for its true owner, Susie)
In the games
Art of Brock from Pokémon Red and Blue
Brock's title is "The Rock-Solid Pokémon Trainer". Brock is quite proud of his rock-hard willpower, and uses Rock-type Pokémon to complement this.
Brock is one of the few truly serious professional Pokémon trainers in the Pewter City area. He's tough, people respect him, and most admire him. Supposedly, it's hard to get him to laugh or drop his serious demeanor, but when he does, he can't stop.
"So, you're here. I'm Brock. I'm Pewter's Gym Leader. My rock-hard willpower is evident even in my Pokémon. My Pokémon are all rock hard, and have true-grit determination. That's right - my Pokémon are all the Rock type! Fuhaha! You're going to challenge me knowing that you'll lose? That's the Trainer's honor that compels you to challenge me. Fine, then! Show me your best!"
"I took you for granted, and so I lost. As proof of your victory, I confer on you this...the official Pokémon League Boulder Badge."
There are all kind of Trainers in this huge world of ours. You appear to be very gifted as a Pokémon Trainer. So let me make a suggestion. Go to the Gym in Cerulean and test your abilities."
"Wow, it's not often that we get a challenger from Johto. I'm Brock, the Pewter Gym Leader. I'm an expert on rock-type Pokémon. My Pokémon are impervious to most physical attacks. You'll have a hard time inflicting any damage. Come on!"
"Your Pokémon's powerful attacks overcame my rock-hard defense... You're stronger than I expected... Go ahead--take this Badge."
Since the Electric Tale of Pikachu is based heavily on the anime, Brock's appearances in it are mostly comparable to his anime appearances. However, he is not constantly traveling with Ash in the manga.
The Japanese name of the Boulderbadge is the Grey Badge.
Most official sources do not give Brock a last name. However, several sources suggest that in the anime, his last name is Harrison. In the July 2006 issue of K-Zone Magazine, Eric Stuart was interviewed and stated that Brock's last name is Harrison.
Brock has the most airtime out of all of Ash's companions, being present in every season except for the Orange Islands saga.