If you go by the antagonistic scale (main/secondary/tertiary antagonist etc.), it has to end at secondary. The term quaternary antagonist and anything below it has been forbidden for years and has recently been purged from the Wiki. So again, read the rules about this issue and don't abuse the antagonistic scale.
Okay yes this part I agree with anything below tetriary is forbidden, tetriary itself is discouraged but I acknolage that many users dislike it which is why I don't put in pages. Also hidden and true are also forbidden
Central (Antagonists that are constantly at the spotlight of the story, but are the minions of the the main antagonist/don't have that many plans compared to the main antagonist, such as Randall Boggs and the Primids