Karas: Ground Zero
Karas, the ultimate henshin badass from the anime of the same name. Figure in black is Karas from S.O.G. Max Factory.
The red armored badass is Raiden from Kakugo no Susume "Apocalypse Zero." Figure is from Manga Realization Armor Shell Zero & Awaking Raiden Set. Raiden is the same size as Karas.. so... they had to battle of course.
The battle takes place after the events of Karas: The Revelation.