|This article is about a/an set of alternate forms in Kamen Rider Gaim.|
- "Melon Arms: Tenka Gomen!"
- ―Transformation announcement[src]
Melon Arms (メロンアームズ Meron Āmuzu) is an alternate honeydew melon-based armored Japanese Samurai form of Armored Riders. Accessed through the Melon Lockseed, this form's Arms Weapon is the Melon Defender, while the helmet the Rider wears is the Melo Kabuto (メロウカブト Merō Kabuto, lit. "Melo Helmet") with the Pulp Eye (パルプアイ Parupu Ai) visor. While it is the default form of Armored Rider Zangetsu, it can also be used by other Riders.
- Armored Rider Zangetsu
- Armored Rider Baron (Kamen Rider Gaim Hyper Battle DVD: Fresh Orange Arms is Born!)
- Armored Rider Ryugen (Kamen Rider Gaim Hyper Battle DVD: Fresh Orange Arms is Born!)
- Kamen Rider Gaim
- Jimber Ride Wear
- Kachidoki Ride Wear
- Kiwami Ride Wear
- Ride Wear (Drive Arms ver.)
- Kamen Rider Ryugen Yomi
- Kamen Rider Zangetsu
- Ride Wear (Watermelon Arms ver.)
- Kamen Rider Gridon
- Kamen Rider Kurokage
- Kamen Rider Bravo
- Kamen Rider Knuckle
- Kamen Rider Bujin Gaim
- Kamen Rider Mars
- Kamen Rider Kamuro
- Kamen Rider Zangetsu Shin
- Kamen Rider Duke
- Ride Wear (Dragon Energy Arms. ver)
- Kamen Rider Sigurd
- Kamen Rider Marika
- This form's Arms Weapon is the Melon Defender.
- Melou Blast (メロウブラスト Merou Burasuto): After Zangetsu activates his Sengoku Driver's Squash function, he throws his Melon Defender charged with maskmelon-shaped energy at the enemy before slashing them with the Musou Saber.
- In Fresh Orange Arms is Born!, both Baron and Ryugen turn down this form because:
- Baron claimed that he doesn't need a giant shield and that he only needs to attack in battle.
- Ryugen felt embarrassed to use the same form that his brother uses.
- Coincidentally, Mitsuzane was able to assume the Zangetsu Shin form, another rider form that Takatora uses.