Why Would an Ultraman Need a System?

Kabu, an Ultraman, happens to encounter a System wandering through the multiverse.

System: “Congratulations, Host! You've been chosen by the strongest sign-in System. As long as you keep signing in, you'll earn rewards, rise above the rest, marry a beautiful, wealthy woman, and reach the pinnacle of life!”

Kabu: “A System? Like those things in human novels?”

System: “Yes...”

Kabu: “Take a look at me. I'm an Ultraman, and I've inherited Ultraman Hikari's teachings. Do you think I need a cheat? Look at the Ultra Badge I'm wearing. I've already reached the pinnacle of life!”

System: “Please, mighty one, let me cling to your coattails!”

Kabu: “...”