I would love for the series to move away from children and teenagers (even Versus main character is basically an awkward teen in a huge crime family/shady monarchy). Adults just offer a much more rich backstory. I've been clamoring for a love story in the series between two people who were in love but broke up, because it's not the type of story you ever see in video games. You always see "young first love" but the wonderful character development you could get out of two adults who did the whole "young love" in the past, then broke up, and now are trying to sort out their feelings would be really nice. Adults just have more history, so you can do stuff like that.

Basch could have been one of the best protagonists in the series if he had been delved into a lot, I mean he lost his homeland to the empire, abandoned his brother and sickly mother to serve another kingdom, failed to protect his future king and his current king, was framed by his brother, lost his second kingdom,was locked up for a few years and tortured, and is now trying to protect and a serve a woman who wants him dead as they both try to stop the empire and revive Dalmasca. That just sounds awesome on paper but the reality is not quite as grand or interesting.

You can just get a lot out a character who actually has lived long enough to pick up some real emotional baggage, to actually have a history long enough to justify their shady past. Shadow is one of the most interesting characters in VI and he's also one of the rare characters who is obviously not 18-20 years old, considering he has a 10 year old daughter.