The newer series are /m/ with all the power armour.
The Riders of old are said to be cyborgs, but that isn't really in the sense of humans with mechanical parts (with the exception of Riderman and Stronger).
Kamen Rider fits the description of Live Action distinctly rooted in Anime and Mange perfectly.
There are also multiple Manga series and an OVA
/m/ is full of Gundam, but /a/ also talks about it, the border between the two boards is extremely blurred.
I like Kamen Rider in /m/, but feel free to post it in /a/. Especially Spirits.