Fighting under the name Volcano, Maguma Iwata heads the Volcano Thieves, a crew invented for the arcade game My Hero Academia: Clash! Heroes Battle. His Eruption Quirk burns his own fat into molten rock, and most of his bulky gear exists to aim that lava and stop him cooking himself.
Orange hair rises off Volcano's head in the shape of a flame, and his brown eyes are large. Both his height and his muscle run far past average.
Navy blue fabric hangs loose over that frame, weighed down by boots, gauntlets, and shoulder pads that look chipped out of stone. Pores run through each of those pieces and vent smoke. A gas mask hangs strapped to the shoulder armor, and an orange belt cinches the suit at the waist.
Almost nothing has been established about the man himself. The game gives him a role, a crew, and a fighting style, but no material to date sets out his temperament or what drives him.
Eruption: Maguma burns his own fat cells to force a lava-like substance out of his body, and the stuff comes out ferociously hot. His preferred distance is long range, and he leans on his gear to get there.
Volcannon: Driving his right arm into the ground, Maguma gathers a heavy volume of lava and fires it outward along several paths at once.
The devices at his hands and shoulders throw his fire further than his body could manage alone, while the pores in the shoulder pieces appear to bleed off heat and hold his temperature down. A mercury thermometer sits at the center of his mask, and no reason for it has ever been stated; the same regulating function is the likeliest answer.

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Yes, in My Hero Academia, Maguma Iwata's Eruption Quirk burns his own fat cells into a ferociously hot, lava-like substance that he forces out of his body.
Maguma Iwata's Quirk is called Eruption. It burns his own fat cells to produce a lava-like substance that he expels forcefully, and he favors long-range combat because of it.
Maguma Iwata is a non-canon character created for the arcade game My Hero Academia: Clash! Heroes Battle, where he leads a villain crew called the Volcano Thieves under the alias Volcano.
Maguma Iwata's signature move is Volcannon, in which he drives his right arm into the ground, gathers a heavy volume of lava, and fires it outward along several paths at once.
Maguma Iwata's stone-like armor and gauntlets have vented pores that appear to bleed off the extreme heat generated by his Eruption Quirk, and a mercury thermometer built into his gas mask likely helps him monitor his own temperature so he does not cook himself.
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