Kaito Kumon

"I'll show you what true strength is all about!"

- Kaito's words to Kota after his first transformation as Baron

Kaito Kumon (駆紋 戒斗) is one of the main characters in the 24th installment of the Kamen Rider Series, Kamen Rider Gaim. He is the former leader of Team Baron, Team Gaim's rival until he chose Zack as his successor, and gave him a mass production Sengoku Driver as a parting gift. Growing up poor, he always believed that the weak warriors are exploited after Yggdrasill took everything from his life. After watching Gaim battling the Shika Inves, he received a Sengoku Driver as well and a Banana Lockseed from Sid, which allows him to transform into Kamen Rider Baron (仮面ライダーバロン).

Past
Kaito is the son of the construction worker. When businessmen from Yggdrasil Corporation shut down his father's company; Kaito and his family became poor, thus he had a vendetta against Yggdrasil and sought the power to destroy the company. In 2011, he formed a dance team called Team Baron with Zack and Peco.

First Transformation
As Team Gaim started to get popular, Kaito awares of Kota Kazuraba's attitude and finds out that he doesn't know how to use the belt properly while still didn't know what to do until he got a call from Sid. Sid then offers him a Sengoku Driver along with the Banana Lockseed. He accepts it and battles Gaim with his new powers. Before they start fighting, Sid gives them new Lockseeds, which form their Rider Machines. The Riders rode their bikes, however a portal appears, which sent them to the Helheim forest. In the forest, they fought some Inves, until the mysterious girl appears to Baron telling his fate using its power.

The Alliance Dissolves
After Hideyasu and Ryoji transform into Gridon and Kurokage, they attack him and attempted to finish Baron off by destroying his belt while untransformed, only for Team Gaim to intervene and defeat the two and take their Lockseeds. The injured Kaito walks away and seems annoyed that he was saved by them, stating that he will continue to seek power. Sometime later, Team Red Hot ended their alliance with Team Baron, which has his team members thinking what will they do next. Kaito responds by stating that he didn't really care about the alliance and that he is more interested in the recent rise in the number of Sengoku Driver users as well as battling Team Gaim.

The Fateful Sengoku Movie Battle
A battle royale is being held exclusively for the Armored Riders in Zawame City. Kamen Riders Gaim, Baron, Ryugen, Kurokage, and Gridon decide to enter the competition. While fighting, a crack opens in the sky and mysterious monsters pour out from it. One of the monsters captures Mai and returns to the crack, with the Riders giving chase. Soon, they find themselves in a Warring States Period-esque world where the Kamen Riders are called Bujin (武神) and are fighting each other. The confused Kamen Rider Gaim then gets attacked by the strongest Bujin Gaim (武神鎧武).

Kamen Rider Taisen
Kaito is seen fighting alongside with Shotaro Hidari as Baron and Joker fighting Kamen Riders BLACK and RX.

Possible Future
In a possible future, Baron, with Gridon on his side, led an army of Inves and Suika Arms Armored Riders against Gaim's army, charging towards the enemy on his Rose Attacker.

Personality
Cold, Kaito believes firmly in the doctrine of "the survival of the fittest", thinking that the weak should perish for the strong. Despite his ruthless personality, he has a soft spot towards kids and humanity, and the safety and care of his teammates, such as what happened when Bravo's weapon hits the stage sign and had Peco's arm broken. When he realized that premature Lockseeds muate humans, such as when Hase eats it and turned into Inves, he shows a more human side by preventing Zangetsu-Shin from killing the mutated Hase. He also quits Team Baron and left Zack (now Kamen Rider Knuckle) in charge as he didn't want his teammates to get hurt due to him being an Armored Rider and being hunted by Yggdrasill.

Unlike his teammates, he dislikes cheating and dirty tricks as he likes to win fair and square, knowing the risks of out of control Inves and how it could endanger humanity, especially if the Inves are in a higher class states. After Kamen Rider Gaim defeated Raid Wild's Ryoji in Inves Game, Kaito became aware that the Rider doesn't know how to use the Sengoku Driver properly. For stating that his foolishness is far more than Kaito's. After obtaining the Lockseeds from Helheim Forest, he has a respect on a previous winning with teams like Raid Wild and Invitto such as giving them Lockseeds (except for Mango as his safe-keep) with no hard feelings. During his encounter with Bravo/Oren, Kaito is honored by Oren as a worthy opponent with a fighting spirit. Later, it was revealed that after Yggdrasill Corporation shut down his father's construction company, Kaito held a grudge against them and wanted to find the power to get back at them which made him who he is in the present.

Arms
As with the other Lockseed-using Riders, Kamen Rider Baron's forms are called Arms (アームズ). With the exception of Lemon Energy Arms, all of his European Knight-themed Arms' helmets share the title Casque (カスク), while his visors share the title Sight (サイト).

Kamen Rider Baron's ending theme is entitled "Never Surrender".

Devices

 * Transformation devices:
 * Sengoku Driver - Primary transformation device
 * Genesis Driver - Secondary transformation device
 * Arms Weapons:
 * Banaspear - Baron Banana Arms' personal weapon
 * Mango Punisher - Baron Mango Arms' personal weapon
 * Unnamed lance - Baron Suika Arms' personal weapon in Yoroi Mode
 * Sonic Arrow - Baron Lemon Energy Arms' personal weapon
 * Medajalibur - Baron OOO Arms' personal weapon
 * Ichigo Kunai - Baron Ichigo Arms' personal weapons
 * Kiwi Gekirin - Baron Kiwi Arms' personal weapons
 * Melon Defender - Baron Melon Arms' personal weapon
 * Lockseeds - Gives access to Baron's form changes, depending on which arm the lock is

Vehicles

 * Rose Attacker - Kamen Rider Baron's main Rider Machine
 * Dandeliner - Kamen Rider Baron's second Rider Machine

List of Appearances

 * Kamen Rider Gaim
 * 1-16, 18-25
 * Kamen Rider × Kamen Rider Gaim & Wizard: The Fateful Sengoku Movie Battle
 * Kamen Rider Gaim: Sengoku Battle Royale
 * Sengoku Movie Battle
 * Heisei Rider vs. Showa Rider: Kamen Rider Taisen feat. Super Sentai
 * Ressha Sentai ToQger Vs. Kamen Rider Gaim Spring Vacation Combining Special

Portrayal
Kaito Kumon is portrayed by Yutaka Kobayashi (小林 豊). As a child, Kaito is portrayed by Kurando Katayama (片山 蔵人).

As Kamen Rider Baron, his suit actor is Eitoku (永徳), who has been the suit actor for the majority of the Secondary Riders of the Neo-Heisei era (except Beast).

Legend Rider Lockseeds

 * In addition to the OOO Lockseed, the following toyline-exclusive Legend Rider Lockseeds are also styled for both Baron and Gridon:
 * Black RX
 * Blade
 * Kiva
 * OOO
 * OOO Tajadol Combo
 * Ankh