MSZ-FS05 Firestorm Gundam

The Gunpla used by Roman "Crimson Fist" Comeva, the head of the Ultimate Form school. It is designed as an unarmed mobile suit, but with the ability to project flames from its body to accentuate and increase the damage of Roman's martial arts.

Weapons
Moeru Kokoro-Ko

The Firestorm's main weapon is its pilot, the man known as Crimson Fist. He is still an active practitioner of multiple forms of unarmed combat, including Pro Wrestling, MMA, and certain aspects of Judo, Taekwando, and Kickboxing. He has developed a specific fighting style he calls the Moeru Kokoro-Ko, or the Burning Heart School of martial arts. This combines heavy physical attacks with the fire produced by his mobile suit. The moves listed below are not an exhaustive list, but merely the moves he has used in the past.

Honoo no Nami

"Flame Wave". The Firestorm swings its palm, creating a field of fire that burns projectiles to ash and blocks beam attacks with intense heat. The technique can be used in close range, but is usually used as a shield.

Kasai no Tatsumaki

"Fire Tornado". The Firestorm wreathes itself in flame, then spins its body rapidly, charging its opponent. If the attack hits, the Gundam will attempt to grapple and perform a spinning piledriver.

Rakka Ryusei Taiho

"Falling Meteor Cannon". The name Roman uses for the large beam cannon mounted in the Firestorm's head jewel, which is the suit's only "traditional" weapon. It maintains the output of the ZZ's Hi-Mega Cannon, which is significant.

Systems and Special Features
Advanced Weight Distribution System

The Firestorm can use the GN Drive in its chest to alter the individual mass of its limbs and body as a whole, allowing it to increase the power of its unarmed attacks. The system can also make the suit lighter, and therefore more maneuverable, such as when trying to dodge attacks.

Trans-Am

As a GN Drive-equipped machine, the Firestorm presumably has the ability to enter Trans Am mode, but Roman rarely if ever uses it, likely considering it unnecessary.