Absolutely. Before CCA ruined him, Char is legitimately one of the most interesting villains/anti-heroes I've seen in a mecha show. Bright Noa has a really good arc as well, as does Sayla. Outside of UC, it gets a bit murkier. G has some fun characters, but it's way sillier. Wing's cast is god awful. SEED has some good stuff, but it quickly ruins them. Turn A is amazing in general. Outside of that, it's pretty standard.
If you go to the more serious OVA stuff, 08th MS Team and War in the Pocket are awesome for character work. Both those are on the ground stories about grunt units and they tell pretty interesting war stories. I also think all the characters in The Origin manage are super well drawn and interesting, much more so than they were in the original series.
Sounds cool, thanks.