Few characters can impress me as much as the Rational Male Companion. These are the characters who are frequently well-acquainted with headstrong women, and though they may not have the guts or the power to rescue damsels in distress, they seek to provide understanding and kindness for the women they hold dear.
When Yoko finds herself stranded in the land of the Twelve Kingdoms, betrayed by everyone she ever trusted, It is the half-man/half-rat/non-ninja Rakushun who proves to her through his gentle and inquisitive nature that there are still good people in the world. Linn Jinto is not the brightest or the strongest man in the Abh empire, but his close friendship with Lafiel exhibits his sincerity and empathy, as well as his subdued sense of humor. Dominic Soleil does not even have the benefit of an entirely sane love interest, but his persistence and use of his own personal strengths (intelligence-gathering as opposed to Giant Robot Fighting) are indicative of his complete devotion to Anemone.
It really doesn’t have to do with the Rational Male as much as it has to do with the fact that he is someone’s Companion. They forge deep bonds with their friends and lovers, a bond tempered by the kind of self-confidence one can only find by being comfortable with oneself, accepting one’s own strengths and weaknesses.