Sounds more like a villain that has to work with the heroes for a common objective or enemy. I'm not saying my assumption is good though, just basing it on what you said. Not saying he's villain. Thanks for this.
Technically, I think namor was an avenger at some times. He was also an international terror inspirer. Not sure if I'm allowed to use the actual word here. He should have hero, villain and antihero tags imo