Shouichi Murota

A politician working in N City. He and Tsubame Murota/Top Speed would argue a lot when they were younger, with Shouichi worrying that Tsubame would be a bad influence on his sister, and Tsubame seeing him as always nagging. However, the two of them eventually got married, with both now finding each other cute.

[Spoiler] He secretly knows that Tsubame is the magical girl Top Speed. [/Spoiler]

(Source: Magical Girl Raising Project Wiki)