If you count every character that has the name hulk and is canonically a version of the hulk then thereβs 8 (hulk, hulk rag, immortal hulk, joe fixit, she-hulk, red-hulk, overseer, hulk-buster). If you count just the ones that are canonically Bruce banner than thereβs 6 (hulk, hulk rag, joe fixit, immortal hulk, overseer)
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That's all I know. Hope you've got to know now.