I wonder if the author will include Jian Yong, the unofficial fourth brother - he was Liu Bei's childhood friend even before Guan Yu and Zhang Fei joined up
Of note: Liu Bei saw some action with his mercenary band (Liu Bei, the 3 guys mentioned above, plus a few other folks) during the Yellow Turban Rebellion, but he legit never participated in any of the bigger battles like Sun Jian and Cao Cao did. IIRC Liu Bei and his crew stayed local to their own province, until they started working for Gongsun Zan: that's when they started to see some bigger action, and they still ended up having to rely on a guy called Liu Yu (no family relations to Liu Bei) in the end. We'll see how this goes!