Companion Planting is something people I dislike have never head of.

Plants that, when planted alongside each other, help each other. Typically one scares away the bugs that will eat the other.

A bit like gang members forming a perimeter around a homeless person.
Or helping an old lady across the road

But are there real-world examples?

Artists and patrons?

Yes, that is good, and fits the NFT direction

But what about a symbiotic relationship between two humans (or groups of)?

I guess “love” counts.