Thanks for these additions. I don't have the evil rangers because they're a part of the regular Super Sentai Claim. The ones I have like Wolzard, are main villains for the show and it's only until the end that he changes. it's because he's in the show against them from the vey beginning towards the end, I kept him in.
Abarekiller is a main antagonist in Abaranger,and stays evil most of the season; he only changes sides in the last few episodes: as a comparison, Jannu (Jeanne) is evil during approximately two thirds of Abaranger, and is the Abarangers's ally during the last third as her real restored self Mahoro (Abareblack's wife) (but of course you were right to include her in the "main villains group) ; Abarekiller is a protagonist during Abaranger about as long as Wolzard was in Magiranger and is evil more than 80% of his episodes appearances.
other points: Yamimaru and Kirika are two characters: each one can be claimed; moreover, there are five Hanarangers: Ayame (the blue one), Sakura (the pink one),Suiren (the green one), Yuri (the orange one) and Ran (the purple one) (fun fact: Sakura is played by the actress who played Fiveyellow);each one can be claimed; of course, you could argue that the Hanarangers must be chosen as a group, like you did with the Zero girls (there are four of them); each one can be claimed;
About the hierarchy: Fuhrer Hell Satan should be placed between the omnipotent god and Hedrian: he is the second in command in Sun Vulcan (and for most of the series, the suppposed leader); and Captain Gregory should be after the four Barban army generals (who should be placed in that order: Sambash, Budoh, Iliess and Battobas; oh I forgot: another Gingaman villain (who must be placed just after the generals: Biznella)
Another note: sometimes, you have two villains in a same line: example: in Denziman, Keller and Mirror who are two characters; same for Bella and Beth of Goggle V and Wolf and Kilt of Flashman :what are your criteria when you decide that some villains could be claimed as a pair or a group, and others individually?
other note: you included Okerampa, the monster-enlarging creature of Maskman; in that case, you should add Gyodai from Changeman, and Kragen from Flashman.
Other point: Nai and Mare are alter egos of Vankuria.
About Burai and the Gouraigers: I understand your point.
Side note: the Nejirangers are in the sentai claim, and not in your sentai villain claim; where should they be in your opinion?