Seiya Ryuuguuin

Seiya Ryuuguuin is the main protagonist of the The Hero Is Overpowered but Overly Cautious series by Light Tuchihi and Saori Toyota.

Personality
Seiya Ryuuguuin is defined by his overly cautious nature. He refuses to face any enemy he isn't sure that he can beat, will attack defeated enemies repeatedly on the off chance that they can revive themselves, and worries that any stranger he meets could be an enemy or carry a deadly illness.

However, his cautious nature also makes Seiya extremely diligent when it comes to preparing for future battles. He'll grind for levels for days at a time and is almost tireless in his training.

Seiya also tends to speak bluntly to others and is quick to express his dissatisfaction with the opinions and actions of others.

History
When Ristarte summoned Seiya to become a hero, he was initially extremely wary of the development and the goddess. While he would eventually accept the position, he refused to begin his adventure right away and instead trained in his room for days.

When he finally did visit the S-Rank world of Geaburande, he immediately bought three sets of armor and items to help him escape from battle. Then he defeated a single slime by repeatedly, and unnecessarily, attacking it with his strongest techniques. However, this ends up drawing the attention of one of the Demon Lord's Four Heavenly Kings, Chaos=Maquina.

Seiya and Ristarte quickly flee from her and return to the Realm of the Gods. Here, Seiya begins training once again. He returns to Geaburande just before Maquina could kill another hostage, the father of a child he encountered earlier, and manages to defeat her augmented form.

After his victory, Seiya begins training with the sword god Celseus but quickly becomes more powerful than the god. Then he and Ristarte begin exploring more of the world, quickly discovering that a zombie army is approaching another village.