Zephyr

The protagonist of the webtoon Doom Breaker, brought into Genesis War as a crossover event rather than as part of its continuity.

His story is a time-slip revenge fantasy: humanity's last defender loses to the demon he was fighting, watches the world fall with it, and is then sent a decade into his own past by the gods who stood by and let it happen. He takes the second chance without any gratitude for who gave it to him, carrying every memory of how the first attempt ended.

He appears in-game as two separate units — Dragon Slayer Zephyr and Battle God Zephyr — both of which link here.