if you could take two different figures and merge them as one which would they by and what color wave would you put.
for me i would like to see X Ray Boy Karma and eyezon in a clear red vinyl whit yellow and orange sprays

you mean something like this post?
http://skullbrain.org/bb/viewtopic.php?f=17&t=28795

^ I think this is meant more as a reimagining of 2 figures resculpted together rather than a mash-up of 2 existing sculpts. Although the mash-up thread is a good starting place for ideas.

For example, I'd love to merge a gacha mecha with a zag to make a mecha zag. Keep the gacha body but put a zag head on it(more robotic though liked mecha godzilla). Switch out the gacha legs for robotic zag legs, and add a tail to it. This would keep the cute round little robot appeal, and add the quirky cute zag expression for a completely crazy new character. For color, I'd go clear grey body (or just clear with a little silver glitter), with robotic guts, and silver flake head/arm/legs/tail. Sprays would be mainly black with metallic blue or green and a little gold.

I'll have to draw this out when I find the time to.