I did a spartan "god-emperor" thing just recently (combine all the bloodline traits from Invictus and deify rulers), and i found the entire dynasty/eugenics game incredibly frustrating. Royal marriages are very buggy and require a lot of micro and memorizing birth dates, just so that your son with ~8+ bloodline traits ends up a mediocre 6/7/7/3 or something like that (he'd be godawful without the bloodline traits). Made me want to not care about characters at all, so naturally i'm doing yet another Rome campaign now.
I find it a lot easier to get attached to characters in a republic too, now, as you're not constraint to all these morons from your dynasty. Check the talent pool regularly (i do it once every election when i reshuffle jobs anyway) and help the talented youngsters along in their career. Let them hopefully increase their traits (with the "rich fools go to school" mod) until aged ~20, then make them governor to prepare them for office (increases admin afaik) or the good martial ones as tribune > legate and then win battles. Won't get a Gaius Julius Caesar story out of all of them, but some kinda do if you help them with it: Mostly prominence, but they obviously can't come back victorious from Gaul and threaten you with civil war if you don't put them in charge for it in the first place.
For instance, i go out of my way to "aquire" Phyrros asap when playing Rome (as soon as you get the claims, basically) for his martial skill and the history shenanigans. As the founding legate of your first legion and Carthage or the Hellenic World to fight against, it's actually pretty easy to get him to Pro-Consul and even Consul later on in his life. Just don't let too many cohorts become loyal to him..