An odd enemy that can serve as either free money or the main threat depending on the stage. One Horn sports high damage output and a gigantic health pool, similarly to Bore. However, his movement speed and range are very lacking.
This enemy becomes less and less threatening as you progress through the game due to the wide abundance of Anti-Red units. However, keep in mind that his DPS stays consistently high, allowing him to slowly but surely plow through your defenses if you don't have any unit that can hold him back like Onmyoji Cat or Apple Cat.
Works at a fire station because he wanted a job to help people. In some cases, people are dispatched instead of a fire truck, but because he's so slow on his feet, the house has nearly burned down by the time he arrives.
A Metal variant of One Horn. Has extreme DPS and takes only one damage from non-Critical attacks, but has very low health, is knocked back twice and is only slightly faster.
A Red-Black hybrid variant consisting of Doge Dark riding a One Horn. First appears in Love is Sickness. They're much faster with greater DPS, attack rate, and 100% chance to knockback cats, as well as two knockbacks instead of one.
A Relic variant of One Horn, with a ridiculous amount of health, DPS, and the ability to Curse Cat Units but still retains pitiful range and movement speed.
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Ironically, he is known as "One Horn" in English and Japanese, whereas he actually has two horns. He is correctly named Two-Horn in Korean.
While his Japanese name, Ikkaku(-kun), literally translates to "One Horn", it also sounds similar to ikaku (威嚇), meaning "threat", "threaten", or "intimidate".
Unlike real Rhinos, One Horn and many of his variants are so slow that they never make it to their objectives in time, a fact constantly mocked in their descriptions.
One Horn has the shortest range of any enemy, standing at a mere 40.