Zenkaiger looks awesome, it's 70's as hell
It oozes with 70's era Tokusatsu without a doubt but that is also the problem. Take some 70's shows like (Toei's) Spiderman, or Kaiketsu Zubat. In Zubat the main character was a likeable "chad" who was over the top and awesome. Takuya from Spiderman was a basic 70's hero but he... Just worked in the role.
I believed his role as a stoic, but charming Spiderman. Kaito on the other hand is just a unrealistic dummy. I'll give a example. When Kaito meets a certain bad guy instead of saying "Hello" or anything a human would say he says "Hey I'm the leader of the Zenkaigers, we'll save the world! Be my friend!" It's off putting.
Kaito sadly is the over hyper "Let's be friends" Sentai leader but lacks the charm of Fourze (Kamen Rider Fourze) too pull it off. I really dislike Kaito.
I'm sorry. I don't mean to ruin Zenkaiger for you. If you enjoy then that is all that matters. I am struggling to watch it personally. Kiramager was not perfect and Covid 19 affected its story but I find myself really liking that show more so than Zenkaiger. I'll still watch Zenkaiger though.