Zachary Ryu

Zachary Ryu is the former second leader of Team Baron and medieval squire of Boxer. He transforms into Kamen Rider Knuckleman through the Walnut Lockseed. And became the second rider of Team Baron.

History
Zachary's past before he became a dancer was unknown. He was seen being beaten up by a few thugs before being saved by Azami. She taught him dancing and invited him to join her dance team, where her brother Peko was also a member of. Later, in 2011, Baron Tomsen took over Azami's dancing team, forming Team Baron. Zachary became one of Team Baron's top dancers, and one of Baron's most devoted followers, developing a cocky attitude in the process towards other Beat Rider teams.

Personality
Zachary serves as second-in-command in Baron's absence. He is an excellent dancer and loyal to Baron when his leader was human. While in an Inves Game, he and Peko set up a cheat in order to make Team Baron the winner by making the opponent's Inves go berserk. After being discovered by Baron however, Zachary never dared to cheat again.

When Baron quits Team Baron so that he can fight the Yggdrasill Corporation and not to put his teammates in danger, he gives Zachary the Team's leadership and gives him a Sengoku Driver. When Oren is about to disrupt the Kamen Riders' stage performance, Zachary shows his heroic side for the first time in the series by risking himself to protect the Beat Rider dancers via becoming Kamen Rider Knuckleman and assisting Armor Warrior.

Arms
Like his fellow Lockseed-using Kamen Riders, Kamen Rider Knuckleman's forms are called Modes while the armor is called Arms

Ride Wear
Ride Wear is Knuckleman's default form undersuit, which is briefly seen during Knuckleman's transformation sequence before the Armor Part attaches or when he changes Arms. However, this form is completely vulnerable to any incoming attacks when shot at directly in the suit rather than at the Arms that is descending down on the Rider.

Unlike the original Kamen Riders, Knuckleman's Ride Wear isn't identifiable through his Sengoku Driver's Rider Indicator faceplate due to using a mass-produced Sengoku Driver. As a result, the Rider Indicator is blank. However, it can be replaced with extensions such as the Genesis Core or Ultra Joint.

Walnut
Ability Perimeters: Walnut Arms is Knuckleman's default walnut-based armored Medieval Squire form. Accessed through the Walnut Lockseed, this form's Arms Weapon is the Walnut Fists.
 * Height: 204 cm.
 * Weight: 107 kg.
 * Punching power: 8.1 t.
 * Kicking power: 9.0 t.
 * Maximum jump height: 26 m.
 * Maximum running speed: 100 m. per 5.9 sec.

In this form, Knuckleman's offensive stats are lower than Acorn's, but he has better agility stats, jumping higher and running faster than the aforementioned Rider.

This Arms' finisher has three variations depending on which function Knuckleman activates from his Sengoku Driver.
 * Squash: Knuckleman jumps into the air while golden energy surrounds his right foot that releases walnut-shaped energy as he strikes the target with a powerful front kick.
 * Au Lait: Knuckleman jumps into the air as a projection of a walnut covers him before he strikes the target with a super powered punch. Alternatively, Knuckleman launches an average sized energy shaped-like walnuts at the target.
 * Sparking: Knuckleman punches the air, creating giant energy spheres shaped like walnuts at the target.

Zachary loses access to Walnut Arms in a battle against Baron, resulting in the destruction of his Walnut Lockseed and Sengoku Driver. He regains the form after receiving a brand new Sengoku Driver and new Walnut Lockseed from Drew.

Chestnut Raiment
Chestnut Raiment Arms is Knuckleman's walnut/chestnut-based armored Japanese Samurai/Medieval Squire form, which is accessed through the simultaneous use of the Walnut Lockseed and Chestnut Energy Lockseed via the Genesis Core replacing his Sengoku Driver's Rider Indicator, this form's Arms Weapon is the Chestnut Fists.

This Arms' finisher has three variations depending on which function Knuckleman activates from his Sengoku Driver.
 * Squash: Knuckleman jumps up and fires the Chestnut Fists' spikes at the enemy, shedding off their shells before landing two fiery punches at once.
 * Au Lait: Knuckleman charges the "peeled" Chestnut Fists with flames and delivers an explosive punching attack.

Giant Watermelon
Ability Perimeters: Giant Watermelon Arms is Knuckle's colossal mecha-like watermelon-based armored Japanese Samurai form. Accessed through the Mecha Watermelon Lockseed (reserved for Armor Warrior), this form's Arms Weapon is a pair of Giant Watermelon Fists reminiscent of his Walnut Fists created from energy watermelons. This form can also interchange into three modes.
 * Height: 311 cm.
 * Weight: 523 kg. (1,153 lbs.)
 * Punching power: 33.2 t.
 * Kicking power: 51.8 t.
 * Maximum jump height: 3 m.
 * Maximum running speed: 100 m. per 9.8 sec.
 * Walker Mode: Giant Watermelon Arms' walker mode, which equips Knuckleman with its boxing glove weapons for combat.
 * Ball Mode: Giant Watermelon Arms' watermelon mode, which encases Knuckleman's entire body to use either for offensive/defensive purposes or as a mode of transportation.
 * Blaster Mode: Giant Watermelon Arms' flight mode, which allows Knuckleman to fire seed-like bullets from the fingertips.

Giant Watermelon Arms is the most massive Arms Change, and it shows by having the most monstrous punching and kicking power once in Walker Mode. Consequentially, it also has the worst jumping height in all of Rider history, and any Rider can practically outrun it. Though this is rendered moot thanks to Ball Mode and Blaster Mode. Also, after a utilization, the Mecha Watermelon Lockseed's color becomes grey, indicating that its energy is low and needs time to recharge back to its green color before it can be used again.

Acorn
Acorn Arms is Knuckleman's acorn-based armored Medieval Squire form. Accessed through the Acorn Lockseed (reserved for Acorn), this form's Arms Weapon is the Acorn Hammer.

Pinecone
Pinecone Arms is Knuckleman's pinecone-based armored Japanese Ashigaru form. Accessed through the Pinecone Lockseed (reserved for Pinecone), this form's Arms Weapon is the Ninjetti Staff.

Devices

 * Sengoku Driver - Transformation device
 * Removable slots for additional Lockseeds:
 * Genesis Core - Essential to access a Raiment Arms
 * Lockseeds - Gives access to Knuckleman's Arms changes, depending on which lock is used

Weapons

 * Arms Weapons - Weapons that come with the Arms:
 * Walnut Fists - Knuckleman Walnut Arms' personal weapons
 * Giant Watermelon Fists - Knuckleman Giant Watermelon Arms' personal weapons in Yoroi Mode
 * Ninjetti Staff - Knuckleman Pinecone Arms' personal weapon
 * Acorn Hammer - Knuckleman Acorn Arms' personal weapon
 * Chestnut Fists - Knuckleman Chestnut Raiment Arms' personal weapon