I finally thought of my own cute alien/human relationships thing and I wasn’t gonna post it but another one crossed my dash, so I am:
Aliens that don’t have to eat. Aliens that absorb their energy from light or heat or something and can’t go dark places or cold places or places without nutritious breathable gasses without technology to help them, but have never eaten. Aliens that are horrified that humans have to kill other beings and grind them up with their mouth parts and they don’t even use tools and oh gosh what even are teeth why do humans have exposed face bones that is TERRIFYING.
But also, aliens that eventually get to know the humans and realize most of them are usually reasonably good at not eating things that are obviously, actively sentient (though there are some disagreements on that front) and anyway they’re super friendly to creatures that can speak and they get very attached and fine, they can be friends with the humans even though they’re weird and scary. And then they’re like ‘I brought you a plant to crush in your mouth parts’ or 'I found this and it’s dead, are you hungry?’ Or 'you look dizzy do u need to eat my potted plant?’ And they are not very good at suggesting/providing food but gosh darnit they try and the humans think it’s adorable. And aliens get invited to dinner parties where there are sun lamps for them to sit under while the humans eat, because friendship, so they learn the cultural stuff around food and they can smell the interesting smells and it’s all good and pure. They don’t really understand the arguments about whose grandma makes the best food, but they nod and make positive facial expressions. It’s ok.