Bonkers appears in the New Challenge Stages in Kirby's Dream Collection: Special Edition as well. He appears in the Fighter Combat Chamber and the Smash Combat Chamber EX.
Bonkers appears to be a gorilla-like creature who wields a large hammer, and has no visible eyes. He appears to wear black pants with torn legs and a belt, and a "jacket" with slits in it for his arms. The muscles on his arms are concentrated to the area around his supinator, in a similar fashion to Popeye. He also has purple sideburns and a Pompadour haircut. In Kirby: Planet Robobot, Bonkers is mechanically modified, as his ears and lower jaw are covered with metal.
Bonkers can use many of the same moves as Hammer Kirby. His most basic attack is charging forward and then pounding the ground with his hammer. Bonkers will also throw explosive coconuts which can be inhaled and spat back at him. In Kirby's Return to Dream Land, Bonkers will occasionally move towards the player and unleash the devastating Hammer Flip attack. This is one of two new moves he gains in this game, the other being a spinning Hammer Twirl attack.
Bonkers lived in a jungle until a circus crew captured and trained him for the circus. While Bonkers was held against his will, the ringmaster decided to watch his favorite show, which was the Kirby show. This is how Bonkers got inspired to meet Kirby in person, so, without letting the circus find out, he quietly escaped and wandered off to Dream Land in search of his favorite hero.
When he finally got to Dream Land, the Cappies at first thought he came to battle Kirby, but soon everyone learned that Bonkers really wanted to train with Kirby. Knowing this, King Dedede had plans for Bonkers, so first he asked Bonkers to impress Kirby with his hammer skills, and tried to smash Kirby with a boulder, but Bonkers smashed the boulder with his hammer to make sure his favorite superhero wasn't hurt at all. Dedede finally resorts to taking him all the way to his castle and getting Nightmare Enterprises to turn Bonkers into a monster. He was later returned to normal, however, and he left, hoping to continue his training.
Bonkers appears as an enemy in Super Smash Bros. for Nintendo 3DS's Smash Run mode. Arguably the strongest Kirby enemy in the game, he can take many hits, deals great amounts of damage, and does not flinch when assaulted. He primarily attacks with Hammer Nail (which can trap the player in the ground), Hammer Swing, and Hammer Flip (which he winds up for an upward blow like Kirby's version instead of a downward smash). Bonkers drops huge power-ups when defeated. In addition to appearing as an enemy in this game, Bonkers appears as a trophy.
"Bonkers" is slang for "mentally unbalanced, mad, or crazy," likely describing his behaviors. His name also contains the word "bonk," which means " to hit or strike," like with a hammer.
A large enemy who wields a giant hammer as a weapon. Bonkers battles you with several moves--his hammer attack and coconut throw could be considered his specialties. Kirby can inhale Bonkers to learn Hammer and Smash techniques. Not many know this, but Bonkers can also break down walls and pound down stakes.”
Bonkers looks quite a lot like a gorilla and swings a giant hammer with a huge launch potential. If he hits you with his own Hammer Flip attack, it's an instant KO. If that isn't bad enough, he also throws exploding coconuts. Bonkers is seriously out to ruin your day.”
This battle is in the Volcano, so we hope you like your hammers hot!”
— Quest Description (Tough) • Team Kirby Clash Deluxe
Are you ready for the final hammer-swinging showdown? He's waiting...”
— Quest Description (Tougher) • Team Kirby Clash Deluxe
In Bonkers' official Kirby's Adventure artwork, he had visible yellow eyes. Yet, his sprites in the game do not show his eyes.
While being a helper, if Bonkers warps to Kirby while he is beneath a low roof, Bonkers will not be able to move, the only way to get out is by warping back to Kirby after he is out of said low roof. This also happens with Bugzzy, another relatively big helper.
Bonkers and Bugzzy are the only helpers who are also mid-bosses, but unlike Bugzzy, Bonkers is the only source of his ability.
Mostly unique to Bonkers is that he is the representative of the Hammer ability (the other enemy is the orange Dygclops) and has only appeared in games where Hammer is present; additionally being the only source of Hammer outside of Copy Essences and Ability Bubbles.
In Kirby Super Star and Kirby Super Star Ultra, inhaling two Bonkers and letting the roulette run gives Kirby invincibility.
He is one of the three mid-bosses that are allied with Kirby in the anime, the other two being Chef Kawasaki and Phan Phan.
In the anime, Bonkers' hammer has a "B" in place of the star symbol seen in the games.