about sentai male human looking villains

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As you've probably noticed, starting with Ohranger, male looking villains were much rarer in sentai than before (if evil rangers aren't taken into account, from Ohranger through Go-onger, there has been only three regular male human looking villains : Dr Hinelar (Megaranger); Gaja (Boukenger ) and Long (Gekiranger).
However, I've noticed something; counting evil rangers, most of the male looking villains appearing in sentai have been what I would call, for lack of better word, trolls; in other words, villains which main aim was messing with heroes and villains alike for their own benefit, which was more often than not, having fun; it seems that Toei is fond of those characters a shuman looking male villains.
In Aba, there was Abarekiller, who was having fun tormenting with the heroes (and the evolien) for his own amusement, not caring about anything else; Gekiranger had Long, (okay, he was the Big Bad, but when he appears, he's pretty alone) who has a lot of fun completely ruining the lives of everyone in the show (hero and villain alike); in Gokai, there is Basco, who plagues both the Gokaiger, many former heroes and the Zangyac, and having a blast doing it; and in Gobusters, there is Enter, (okay, he's almost the sole regular foe) who's having a blast in messing with the heroes.
Besides, Brajira (despite not being human looking, he's a Gosei (former Gosei) Angel, like the heroes) is a troll as well; and Juuzo, despite having a different characterization, plays somewhat that role in Shinkenger.
Your thoughts?