This is what we found on Wikipedia regarding the SKAAR:

Skaar is a fictional character, a comic book superhero appearing in American comic books published by Marvel Comics, usually as a supporting character in stories featuring his father, the Hulk, who conceived Skaar with the extraterrestrial Caiera during the 2006–2007 "Planet Hulk" storyline. Created by writer Greg Pak and artist John Romita Jr., the earliest version of the character appeared in a cameo in an alternate history story in What If? Planet Hulk #1 (cover-dated December 2007), in which the character was drawn by Rafa Sandoval. The Earth-616 version of the character appeared in World War Hulk #5 (January 2008), by Pak and Romita.

The character has been adapted into various media outside comics. He first appeared in animated form in Hulk and the Agents of S.M.A.S.H. (2013–2015), where he is voiced by Benjamin Diskin and depicted as unrelated to the Hulk. Additionally, Wil Deusner portrayed Skaar in a cameo appearance in the Marvel Cinematic Universe television series She-Hulk: Attorney at Law (2022).