Aries Shion is a DPS that scales his threat from his own HP pool and is built around burst picks. His core pattern is to set up Crystal Robe when need and get into single-target execution through Stardust Revolution - Awakened, and one shot any enemy. Endless Starlight helps keep that plan online by resisting control. In the right window, he can still pressure priority targets and punish teams that rely too much on damage-sharing effects.
The problem is that the current meta has much more damage mitigation, higher baseline durability, and better tempo tools, so his one-shot identity is no longer as reliable as before. Light Speed Fist adds little outside of filling turns, and his support value is mostly limited to the Crystal Robe package. Overall, he can function, but compared to modern options he feels like a unit from the past.