Yasuo
Yasuo is a powerful champion who can easily take down multiple enemies at once with his ultimate ability, Last Breath
Xayah
Xayah is another great pick for Swarm, as her ultimate ability, Featherstorm, allows her to deal damage to multiple enemies while also being mobile
Illaoi
Illaoi is a tanky champion who can control the battlefield with her tentacles. Her ultimate ability, Unleash the Kraken, can deal massive damage to multiple enemies