On my PS4 run I'm also doing it Aqua, Ven, Terra. Mostly because I'm petty and want Terra to be the one who gets the Million Dream's Award sequence. So far all I have left for Aqua is Mirage Arena business and finishing up Rumble Racing. I'm not dealing with the bonus bosses until I clear all there files.
Best of luck on your Terra run and let me give you one piece of advice: Terra is a slow moving character but can deal massive damage. It is best to keep his commands balanced between action and restorative commands. While Terra can take a hit he tends to recover health a bit less successfully than his friends. One of the commands you will want to avoid actually using in combat is Sacrifice. This attack is not worth it because it can easily make Terra have too little HP to take a decent hit.