"PURGATORY! They will BURN!"
Whenever there's the need for nothing but scorched earth remaining, Inferno is summoned.
His name suggests it already - he loves burning things, the sound and sight of fire and explosions. His passion also shows in his combat strategy - all of his units are equipped with a number of flamethrower tanks, additionally to regular ones. They make sure that every battlefield turns into a burning pandemonium. He is particularly partial to them, usually treating them better than the others in an everyday context. Not that he would use them with any more regard than the rest of his forces. To him, every soldier is expendable. Joining the Legion gave him virtually infinite replacements for the lives he sacrifices carelessly. He does not care about the power or fame that come with being a high-ranking general. All that matters to him is being able to live out his need for thoughtless destruction. Armageddon isn't always pleased with Inferno's wasteful use of resources, but has been condoning it so far because the general's strategy of just throwing hordes of tanks into battle (effectively employing machine wave tactics), and caring little who returns as long as they kill enough enemies is evidently successful.
Commanding and abrasive tone. Very demanding, authoritarian. Questioning his orders or failure to carry them out the way he intended are a direct way to cruel punishment. Patience is a foreign word to him; Inferno is prone to outbursts of anger when things don't go his way. Will make seemingly arbitrary decisions, which however make perfect sense in his own mind. Anyone who had to deal with him would describe him as unstable, but the people he most closely surrounds himself with do not mind it all that much - or at least pretend they don't. Despite his capricious temper, he follows orders given to him by people he sees as his superiors; which are few.
He wears special paint - Sulfur's grimace glares from his bow. Inferno feels a strong connection to the deity and shows this off unabashedly, something that is generally considered a taboo or at least poor taste. He doesn't care about any supposed bad luck that people tell him it will bring, believing that his devotion will have the opposite effect.
Additionally to his cannon, he has equipped himself with a coaxial flamethrower.
He has been a general of Armaggeddon's army for a while now. It's not a secret how he joined, although the exact circumstances are not widely known. According to his own - admittedly disjointed - accounts, he was the leader of a team before his time with the Legion. As they came to take his territory, he was furious; he proceeded to defeat more than one of their units, and Armageddon took notice of him. Inferno was approached by a messenger who was supposed to warn him about interfering with the Legion's business any further - whom Inferno promptly killed. Sending back the messenger's burnt turret as a sign of his disregard, he let them know that he had no intentions of desisting. Instead of being enraged, Armageddon was impressed by the ferocious response. As a test of Inferno's ability and potential, Armageddon sent a task force that managed to defeat his team, if with great difficulty. The task force's orders were to make him an offer to join them if he did sufficiently well in the battle - he begrudgingly accepted it. Since he wasn't just a regular member, however, he was assigned the leader of a specialized unit right away. Despite the following victories, he wasn't satisfied with this and did something that others wouldn't dream about - he demanded to see Armageddon and have a talk. No one but him had expected that Armageddon would actually allow this, but not only did he invite Inferno to his headquarters, he also had news for him: The pyromaniac was promoted to a general ... that is, after Armageddon kicked his rear first. Inferno acknowledged this and set out to assemble the force he leads today.
This area was marked for extermination by our great Lord Armageddon. For the ones joining us for the first time today, let me explain what it means: No prisoners. No survivors. No remains. For every enemy that gets away, one of you will be terminated - I don't care who. Now get to your positions. Fire on my command. I want to see their burning hulls light up this night!