The most interesting thing about Sisyphus is that initial attack he does automatically. On some whale accounts, it’s sure to be a one-hit kill, but for everyone else… it’s a skill with an interesting animation, but nothing more. He puts on some buffs, shields, debuffs, but he’s no better than other supports in the game, nor does he do that much damage. It has an area attack that could be interesting… but it will probably just annoy and charge the rival Thanatos or Seraphina.
Arrow of Light fires at the start of odd turns dealing damage to the highest ATK enemy and applying Holy Light Mark (The Mark reduces P.DEF, C.DEF, and SPD) to them and 3 random enemies, while healing the lowest HP ally. Chiron’s Light Impulse deals damage to all enemies, purifies 1 debuff per ally, applies a shield, and increases healing received. Chiron Storm at even turns deals damage to enemies equal to allies with shields, boosting his attack and Crit.
It sounds like it could be a lot of things, and it is, but none of them have the impact a unit needs to make it into the meta. For now, its use is limited, and aside from a few high-level accounts, it’s not seen in PvP. It needs an Awakened Cloth.