@smakian Trails in the Sky and its sequels are ones we always recommend to people. It's a JRPG with a fantastic story (though it takes a bit to pick up), and ought to run on a pretty junky computer (though it depends on just how "low-powered" you mean by low-powered); system requirements are pretty bare-bones:
(the later games in the series will need more computing power, but the first five games are all ports of PSP games and can run on a potato)
-F