Sagittarius Aiolos is a DPS character in Saint Seiya Awakening focused on heavy single-target burst, but currently he has almost no practical use and is mostly a collection unit. His kit is very linear: Golden Arrows is his core nuke, Arrow of Justice can grant an extra move after a kill, and his Awakened passive can fire a final retaliation shot when he dies. On paper, that sounds threatening for finishing targets and snowballing momentum.
In real matches, however, the cost-to-value ratio is poor by modern standards. Golden Arrows is expensive, depends on ally attack contribution, and still does not deliver enough pressure compared to newer DPS options with better efficiency and utility. The death-trigger from Dying Heroes is flashy but inconsistent as a win condition, since it requires Aiolos to be eliminated first and does not fix his tempo issues. As a result, he is currently not a serious competitive choice and remains mostly a collector character.