Confessions of Three Kingdoms Characters

The tenacious Liu Bei and the capricious Lu Bu, are their characters innate? The ambitious Cao Cao and the brilliant Zhuge Liang are as comfortable as we imagined? Yuan Shao, who dominates Hebei, and Liu Biao, who dominates Jingchu, why are they always so slow to watch their opponents rise? Are all the Three Kingdoms careerists? How do ordinary people survive in troubled times?