thank you to everyone who has contributed so far!
i did a bit of research last night on fictional INFjs (all of the relevant search results were going by MBTI, though it's still viable. i just ignore what they have to say about functions) and it seems as if ra's al ghul is the quintessential EII villain. his character motivations echo what i originally posted—twisted sense of right and wrong (unsure which function to attribute this to), idealists, heroes in their own mind, noble goals yet bizarre methods... their motivations can typically be simplified down to "doing [insert evil deed] for the so-called good of humanity". it corresponds to the
well-intentioned extremist trope.
i also think unhealthy EIIs, in fiction or otherwise, could potentially manifest self-righteous tendencies.