Well... I try to pick sprites that atleast work with the style of the battle chars without being limited to only using Tales of the World 2 & 3 sprites... which would suck... because then the game would just be Tales of the World: Cyber Radiance... or something... which would suck.
I should also note that all the battle chars where ripped by me personally because people tend to leave out unnecessary animations when making battle chars the default way (because I think there's a limit to the amount of animations you can have that way right?) and I also rip most of the battle backgrounds myself too because it's hard to find ones that work with this style.
But yeah I'm pretty happy with my consistency for the most part.