>>7910175They are from the Shokugan line. I'm still researching them myself because I wanted to see what else they had. It is hard because they scale close to the HG, but are noticeably different.
I believe they started around GMK, and they made packs for Godzilla Vs.MechaG., Tokyo S.O.S., and Final Wars. They also made a 60th anniversary set with G2014, GFW, and a Kiryu. These ones released this year were also released in Japan and had two other figures excl. to them for now (Godzilla Earth Atomic, and the Shin Godzilla Atomic).