Kaito Kumon

Kaito Kumon (駆紋 戒斗) is one of the main characters in the Kamen Rider Series installment, Kamen Rider Gaim. He is the leader of "Team Baron", Team Gaim's rival. Growing up as a poor guy, he always believed that the weak warriors are exploited. 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).

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.

Alliance with Team Invitto and Raid Wild
After fighting some Inves, they cancel their transformation as Kota tells Kaito that he and Mai entered the Helheim Forest before and the origin of the Lockseeds. As Kaito hears that, he leaves Kota behind and grab a handful of Lockseeds before Inves appears. As he finishes fighting Inves, Kaito returns back to the real world with the Rose Attacker. He then forms an alliance with Teams Raid Wild and Invitto as Kaito gives them Lockseeds to win against Team Gaim.

As he hears that Team Gaim have a new Armored Rider and Hideyasu loses to the new Rider, Kaito was disappointed to him. He then gives him a new Lockseed and started to call him weak, which made Hideyasu curious about the alliance. Kaito arrives at Team Gaim's garage and challenge Mitsuzane with two Inves on his side. As Ryugen is beaten up badly, Kota arrives and joins the fry. While fighting Gaim, he tells Baron about true meaning of strength, which he denies it. Gaim use his Ichigo Arms to finish off Baron's Inves as his alliance appears and transform into two new Armored Riders.

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 Kota 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 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.

Encounters Bravo
With the appearance of Bravo and got interviewed with Beat Rider Hotline. Kaito reappears at Drupers and already saw how powerful Bravo is, even he's not a Beat Rider or despised by Kaito, with the latter set his sight against Bravo to know how strong he is, but before he leaves, he tells Kota to beat him to get it over with, if he doesn't to get pissed with the Durian Rider. During his battle with Bravo as Baron, he states Bravo is more powerful as a monster, in which led Baron being defeated along with his summoned Inves by Bravo. Oren then returns Kaito's Banana Lockseed, stating that Baron is a worthy opponent with a unbreakable fighting spirits but needs to train more to be more powerful against Oren and reveals to him that Baron was not the one Oren's really after: it is the Riders from Team Gaim.

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. 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 the Lockseed (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.

Arms
As with the other Lockseed-using Riders, Kamen Rider Baron's forms are called Arms (アームズ).

Devices

 * Sengoku Driver - Transformation device
 * Lockseed-exclusive weapons:
 * Banaspear - Baron Banana Arms' personal weapon
 * Mango Punisher - Baron Mango Arms' personal weapon
 * Medajalibur - Baron OOO 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 Rider Machine

List of Appearances

 * Kamen Rider Gaim
 * 1-8
 * Kamen Rider × Kamen Rider Gaim & Wizard: The Fateful Sengoku Movie Battle
 * Kamen Rider Gaim: Sengoku Battle Royale

Portrayal
Kaito Kumon is portrayed by Yutaka Kobayashi (小林 豊).

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).