Kael Thalasson of The Abyssal Wardens from warhammer 40k

This is Kael the younger Brother to Ben Thalasson. Kael is courageous, curious, energetic, and fiercely loyal to his friends. He has inherited his family's natural talent for swimming, but he is still learning patience and self-discipline. His greatest strength is his willingness to help another aspirant, even when doing so slows him down. His greatest challenge is learning that he doesn't have to match Ben's accomplishments at eleven years old. Ben hopes that Kael will eventually become a Scout in the 10th Company, the Young Tides. But more importantly, he wants his little brother to grow into a compassionate warrior who protects the people of Thalassus Prime.