The scorching kaiju that emerges in Hoshimoto City amidst a severe heatwave, with temperatures soaring above average for consecutive days. While typically moveing on all fours, it stands on two legs during combat and attacks with the claws on its forelimbs (Homger Heat Claw). The sharp fangs (Homger Fang) are capable of absorbing energy, which it uses to drain gas from tanks and even energy from Ultraman Arc as it breaks through the Arc Giga Barrier. Homger can also unleash a high-temperature fire attack (Homger Fire) from its mouth.

As Homger temporarily ceases activity after its initial battle with Ultraman Arc, You-bot conducts brainwave and thermography measurements, revealing that Homger is nocturnal and in a state of sleep, and that its internal heat energy continues to rise unchecked, threatening to cause an explosion large enough to obliterate Hoshimoto City. It is also discovered that Homger might have multiple hearts, but it is later revealed that Homger is harboring new life within its body, appearing on Earth to give birth to this new life at the cost of its own.

It is known worldwide for the "Legend of Homger," which describes it as a kaiju appearing with spirits and erupting on the night of the full moon. However, it is actually passing on its explosive energy to its offspring to ensure the continuation of its life.