Have you played Midnight Suns? That's kinda how they wrote Blade & Captain Marvel's relationship. She's so powerful that he doesn't worry about accidentally hurting her if he ever vamps out.
A street level hero and a space level hero could be an interesting pairing. They bond over their shared desire to do good and deal with capes stuff but it's still basically a relationship between a cape and a civilian due to the power differential.
"Oh, honey, it sounds like you're having a really tough time with that serial purse snatcher at Yankee Stadium. Do you want me to postpone my thing with Jro-dek, God Swallower to do a team up?"
"Thanks for the offer, sweetie, but my shoulder still hurts from our last one against Planetbuster Bill."
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"Thanks for the offer, sweetie, but my shoulder still hurts from our last one against Planetbuster Bill."