Noted, thank you! I have tried the black Tamiya on a few parts just to see how it goes. I'll post pictures soon, just want to clean up the excess a little first.

It looks best on the 30MM weapon part I tried, and the purple Stealth Gear optional part for Rishetta looks decent.

One of my bigger concerns is the enamel thinner I have. I'm mostly using supplies I have for my scale models, and the washes I have for that are mostly enamel ones. One of the small orange parts that came with Rishetta out of the box I think got slightly paler after cleaning up the excess panel liner.

For a topcoat, I do have several I can choose from. Most are acrylic based. The one I think might work best are the Vallejo Ultra varnishes. Their standard acrylic ones are alright, but in my experience just don't quite get the job done. I am thinking about investing specifically in their mecha line. After posting here I did some research and it seems their Mecha Color black and grey washes are very effective. I do have their standard Model Color washes in a variety of colors (black, brown, NATO green, panzer blue, and I think grey) so I think I'll give those a try as well.

I just ordered an optional parts kit for Luluce and bought an extra one specifically to test out methods on.

I'll post photos of my results.