Marvel DC Crossover

Starfox A K A Eros of Titan first appeared in The Invincible Iron Man issue 55 in February 19 73

Starfox in Eternals 2021

Thanos Avengers

Starfox is the  brother of Thanos 

I'm Eros

This is Pip

The Mad Titan Thanos

Starfox grew up on Titan to be a fun-loving, carefree adventurer in contrast to his brother Thanos

Eros is the youngest son of A'lars 

Eros found out that Thanos has killed their mother