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.
One option for the main antagonist could be a powerful sorcerer who wants to harness the Oc Hulk's power for his own dark magic. He might see the Oc Hulk as a key ingredient to a spell that would give him ultimate power over the world. The sorcerer could use his magic to create illusions and traps for the Agents of Smash, making it difficult for them to protect the Oc Hulk.
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.
Overall, Hulk is usually stronger than She-Hulk in the comics. Hulk's rage-fueled power can reach extreme levels that She-Hulk doesn't often match. However, She-Hulk has her own unique strengths and abilities that make her a formidable character in her own right.