Minakami, Wataru

海神航

The brother adored by all his sisters. In their view, he is incapable of wrongdoing. Until the final collection of illustrated stories, the brother's face was consistently concealed or turned away from the reader to obscure his appearance. The goal was to lead the reader to believe he was the character. As the series concluded, a slightly altered version of the anime's character design was utilized.
Since the siblings' father is never present, and the sisters' mothers are frequently occupied with their upper-class careers, Wataru acts as much of a parental figure as he does a brother. He dedicates significant time to teaching or guiding them through various life crises, regardless of how trivial or difficult they might be. Consequently, the sisters credit him with many of their personal achievements. Despite their steadfast testimonials, Wataru is not flawless, even in the magazine stories and mini-novels. He is undoubtedly selfless, however, and will do everything within his power to assist his siblings whenever humanly possible. Wataru also appears to have an uncanny ability to appear exactly when a sister needs him most.
Naturally, the sisters' greatest shared fear is someone or something taking Wataru away from them. For this reason, some of them entertain and dream of somehow becoming his wife or life partner. This inclination is far more innocent and less disturbing than it might initially seem: there are no incestuous intentions. As pure as Wataru’s sisters are, they display signs of jealousy and concern when a non-family member "takes" their brother away from them, fearing he might forget or leave them.
(The name Wataru Minakami was assigned to the brother character only for the first Sister Princess television series. In Sister Princess Re-Pure, he is simply referred to as 兄, Ani, or "Brother.")