Red Hulk in the comics is General Ross after undergoing some kind of transformation. He's got immense power and is a force to be reckoned with. His appearance and abilities differ from the classic Hulk in several ways.
The Red Hulk is the result of a transformation. Some scientist or villainous force experimented on a character to create this powerful and angry version.
Sure, She-Hulk is related to Hulk. Jennifer Walters, aka She-Hulk, got her powers because of a blood transfusion from her cousin Bruce Banner, who is Hulk. This connection is a key part of their storylines in the comics.
Captain America would be a great addition. His leadership and moral compass could guide Hulk and She - Hulk when they face difficult decisions. And his combat skills could come in handy during battles.
Comics usually depict Hulk as stronger than She-Hulk. Hulk's strength levels are often at a much higher magnitude, but it doesn't mean She-Hulk is weak by any means. She has her moments and skills that contribute to her being a significant character in the comic universe.