(hhhhh apologies for resurrecting an ancient thread)
I'm still new to Glyos and all, but I am absolutely in LOVE with Nistuff's Outlander.
In particular, my favorite so far is Stabilized Toal:
You really don't see figures in that dark blue, dull magenta color combo all that often (I think the only place I've ever seen them was on some older Transformers) and it was also my first Glyos figure ever. Just picked up a Stabilized Andur to go with him, too.
I love the aesthetic and I'm really surprised by how much character the different heads and torso flipping-make: I can go from an unassuming little Outlander to a towering, fierce Leyden with just a few pieces, and that painted Styre head is absolutely gorgeous (may or may not have picked up some figures from Ni recently to build my own approximation of a certain doctor with that head, quite excited about that).
All it really took was me getting that first Toal to get hooked on Glyos, and when I got that first accessory pack it blew my freaking mind and it's all been uphill from there. Currently working on saving up to get some stealth parts from Onell to beef up that Toxic Leyden with the translucent sword and mask in the first pic, and might just make a custom build/character out of him, we'll see.
Regardless, the Outlander currently stands as my favorite figure/line. (although Pheydens are a close second.)