Shoutarou Yukimura

He is the older brother and the main protagonist if you will. He is much more responsible and mature and so his job is too look out for his younger brother who always gets into trouble. As the older brother he takes it upon himself to always be one step ahead in everything he does and that includes his swordplay and overall badassness. While his brother is quite weak and can often barely put up a fight he will always be the one to step in and end things before they grow out of control. Source: chioky.deviantart.com