The Alien Magma here are based on a bio page I did for them.
This is purely fanmade and not canon to the original.

1. They have tails.
2. They have fur.
3. They have claws.
4. Magmatic Steel (the silvery stuff on their bodies) is a naturally occurring compound on their planet and all life there has it in their DNA.
5. They have kittens in litters of 5 at best. Anything above that or just having a single kitten is pretty rare.
6. Their eye colours change as they grow up.
7. They are LGBTQ+ friendly.
8. They are extremely heat resistant, to the point of being able to play with lava as if it were water and handle hot stuff in general.
9. It is considered normal among their kind to address a kitten (yes, they call their youngsters kittens) as you would with anyone else. No one really gets annoyed, just reminds the kid not to be intrusive.
10. They don't have a concept of weddings.