The only method is via Winlator (a Wine + Box86/64 wrapper for Android).
Rivals of Aether uses a distinct 16-bit pixel art style that ages beautifully. Because it isn't pushing hyper-realistic 3D textures, the game runs like a dream on most mid-range Android phones. rivals of aether android port
The mobile builds (whether emulated or fake) cannot access the Steam Workshop API. The only way to get workshop characters on Android is to manually inject custom .nut scripts and sprites into a Windows build running via Winlator. This requires advanced knowledge of the game’s file hierarchy. Expect crashes when trying to load complex custom characters like "Sylvanos." The only method is via Winlator (a Wine