What are the key factors to consider when choosing an ebike for electric unicycles and monocycles, and are there any notable models that stand out in terms of power, efficiency, and overall performance? How do factors such as motor type, wheel size, and battery life impact the riding experience, and are there any trade-offs between these different components that riders should be aware of? Additionally, what role do aesthetics and design play in the selection process, and are there any emerging trends or innovations in the field that are worth keeping an eye on? Are there any ebikes that are specifically designed with electric unicycles and monocycles in mind, or are riders typically adapting more general-purpose ebikes to suit their needs?