Sumomomo Momomo: The Strongest Bride on Earth: Sanae Nakajima

 Sanae is a martial artist and comes from a family that is associated with the horse of the zodiac.  She has a superhero alter ego called Tenchū Senshi Uma Kamen (Divine Punishment Warrior Horse  Mask) and is meant to protect Koshi from the shadows.  Like a horse her kicks are strong. Sanae has a more conservative personality that clashes with her Kamen uniform that allows her to gain power the less of it she wears.  She develops a crush on Koshi despite it being her duty to support Momoko and Koshi's marriage.