Yi Yan Xialou, the Water Emperor, holds rank among the Althea Royal Guard’s Three Grand Generals, distinguished by medium-length maroon hair and a left-sided braid. Her Ballot Replica, a jeweled butcher knife, channels hydrokinetic prowess—manifesting water shields and lethal pressurized torrents. With a combat count of 131471, she stands among Althea’s most formidable warriors.

During a pivotal strategy session with King Charles De Bergt Althea The 11th, she advocates arming the Special Service with Ballots to avert war, clashing with Robert Du Vanvich’s opposing tactics. Following the king’s assassination, she and Freidkam Von Lightning stage deaths after Robert’s betrayal, later resurfacing to infiltrate the Special Service. Captured and confined in the Abyss, they reclaim their Ballots to reenter the fray.

In the Last War Arc, she saves Robert from Special Service generals, confessing lingering romantic feelings and lamenting their fractured alliance amid clashes with adversaries like Luine. Post-war, she brokers peace with former foes and nurtures a tentative bond with Robert.

The epilogue reveals her inviting Robert for a private drink, her unguarded demeanor faltering when Sumeragi interrupts with a proposal to him. Robert’s comforting kiss resolves the tension, cementing their connection. Outside battle, her legendary alcohol tolerance rivals Nana Bassler’s, adding a layer to her storied reputation.

Her journey weaves martial mastery, covert resilience, and emotional revelation, closing with reconciliation and vulnerability that mend old divisions.