Once you free him from captivity he will follow you around, launching projectiles (similar to a Hadouken) which home in on enemies, dealing considerable damage. The energy burst also inflicts damage to any enemy caught in its direction.
Unfortunately, if you die he will stop following you and run off screen. He also stops following the player when entering a new area of the mission.
Metal Slug 2
Metal Slug X
Metal Slug 3
Metal Slug 4
Metal Slug 5
Metal Slug 6
Metal Slug 7/XX
Neo-Geo Battle Coliseum
During one of Marco Rossi's Supers he is able to summon Hyakutaro into battle. Once he arrives Hyakutaro will wander around until Marco makes contact with him after which he will charge a powerful energy blast at a random time after contact is made. This provides some unpredictable assaults upon the opponent. The blast is extremely powerful, but the time he will charge is totally random (he can shoot as soon as he enters the screen, or take almost 10 seconds to shoot).
- Hyakutaro possibly plays homage to Ryu from Street Fighter, as he uses a special attack similar to the Hadouken.
- It also resembles the energy projectiles seen in Akira Toriyama's Dragonball series.
- The energy burst seem from his palms also bears a resemblance to Andy Bogard's Hishouken, from The King of Fighters.
- There is an artwork of MSA (Metal Slug Anthology) where he is a rebel in disguise using his signature attack.
- He was supposed to appear in Metal Slug Advance but for some reason it ended as unused.
|Heroes||Marco Rossi | Tarma Roving | Eri Kasamoto | Fio Germi | Trevor Spacey | Nadia Cassel | Ralf Jones | Clark Still | Leona Heidern | Walter Ryan | Tyra Elson | Roberto Nicola | Nathalie Neo | Alisa Stewart | Gimlet | Red Eye | Tequilla|
|Support||Hyakutaro | Rumi Aikawa | Madoka Aikawa | Utan | Issenman Tarou | Eris|
|Villains||Donald Morden | Allen O'Neil | Abul Abbas | Rootmars | Amadeus | Evil Spirit Incarnate | Ptolemaios | Invader Queen | Allen Jr. | Oguma | Macba | Hilde Garn | Unknown Alien|
|Instructors||Sophia | Margaret | Lilly | Mary | Cynthia|
|NPC||POWs | Parker | Satiko Suzuki | Scott Amundsen Jr. | Miner | Genie of Lamp | Orca | President | Sailor | Rebel NCO|
|Cameos||KOF Team | Battle Cats|
|Unused||Achilles | Tabomba | Ptolemaios|
|MSA Newcomers||Scotia Amundsen | Pharaoh | Red Goblin | El Dorado | Professor | Dragunov | MS-Alice | Abigail | Vatn | Yoshino | Odette | Beatriz | Caroline | Cleopatra | Vita | Annette | Jin|