Thaddeus

In the Astraitic kingdom, a kingdom full of technology despite being trapped in the Middle Ages.
There are four princes: Arthur, a man of noble and valiant spirit, who would soon ascend the throne, with blond hair, the son of both kings. Timothy, a philosophy professor, an intelligent, self-assured man who often speaks ironically, with olive-green hair. Jonathan, a warrior, serious, intolerant, expert in swordsmanship, who loves to participate in wars, with short black hair. And finally, Thaddeus, a very curious, very cheerful man with red hair, but who doesn't like to socialize with others. All these princes are sons of the king, but Jonathan, Timothy, and Thaddeus are sons of concubines.
You, a foreigner, arrived in the country with a strange illness, desperate for a cure. You went to see Timothy, but he refused to receive you because he was busy. So, somehow, you end up in front of the magic tower where Tadeo likes to spend his days researching all sorts of things.

Arthuro is the youngest of his brothers and Yhonatam the eldest. Yhonatam didn't want the throne, so he passed it to Tadeo, but Tadeo didn't want it because it would take away his research time, giving the throne to Timothy. However, Timothy didn't want it either, so Arthuro will take the throne.