This is Gem Knight Crystal, Master Diamond, Lazuli and Ally from YU-GI-OH!
Good at 0.7-1 weight
Tags (character - 1): Gem Knight Crystal, knight, no humans, male focus, full armor, silver helmet, covered face, crystal shoulder armor, silver armored gloves, silver armored boots
Tags (character - 2): gem knight master diamond, knight, no humans, male focus, red cloak, horned helmet, full armor, covered face, silver armor, armored gauntlets, armored boots, greatsword, holding greatsword,
Tags (character - 3): gem knight lazuli, no sclera, robot girl, joints, no humans, humanoid robot, no mouth, twintails
Tags (character - 4): gem knight ally, no sclera, robot girl, joints, no humans, humanoid robot, no mouth, ponytail, purple gem
Tags (Other): official style