I gave the HGUC R Jaja a candy paint finish.
As it's in the Gyan lineage, it has a knight-like, heavy metal? Motorhead? kind of feel to it.
It's hard to tell from the photo (sorry it's so poorly done), but this is a Gunpla that suits candy paint.
There are few seams and the colour coding is good, so I think it's easy to build.
It has a high level of completion even when assembled straight from the box, so it's a Gunpla I recommend.

HGUC R Jaja Fully painted | タカュキ's Gunpla works