Geralt is Witcher 1-3. Ashen One is Dark Souls 3. Talion is Shadow 1-2.
Wolverine is 616. Batman PC/N52. Shredder is IDW composite.
Game Characters have their best gear and armor and full unlocked skill/abilities.
Comics characters have standard gear. Wolverine with healing and Adamantium. Batman with his armor and utility belt. Shredder has his claws, sword, and armor. All are current or last seen.
Death or KO.
Battle in a large forest with ruins scatter about.