When I saw the idea of "Dollmaster", my first thought wasn't FFX's Lulu but actually from another RPG; Shadow Hearts Covenant. There was a playable character in the game called Geppetto (homage to pinocchio?) and he had a doll called Cornelia which he could dress up in certain elemental dresses giving it unique spells. Granted Geppetto had has access to other spells as well (that everyone could use) so you could actually make in him to a healer/support or damage dealer if you wanted but it was the idea of changing your doll when you needed to that made it different (compared to Lulu's toys that don't do anything but look visually cute).