If i could change chrono cross i would make it explain more about the fall of guardia,what happened to crono and others, explain more on the whole magic guild, eliminate the most annoying accents, eliminate the non essential characters (like Greco,Mojo, Pierre, Nikki, Mikki, Mel, Neo-Fio, Van, Gough etc.) from being in the game, explain more on the ghost children(are they crono marle and lucca or a bunch of ghost who like making us think there crono marle and lucca?), make guile secretly Magus who we don't know officially is him until the end, make schala look like she did in chrono trigger(blue hair and stuff), make harle less of a enigma and get rid of her fake accent, make serge speak, make it so that the Prometheus circut reveals it used to be robo, make it that the time crash is explained upon, change Glenn's name so people don't think he's frog, make turnip look less like a cheap frog knock off, make pip's more essential to the story because he's interesting and make his forms look more like devils and angels instead of just adding fur and changing his color and make his forms stay after you turn of the system. Also make it so that you can leave serge behind like you can crono in chrono trigger, give every one more development and backround, make gaspar and spekkio make a guest appearance in the bend of time, make that guy with buck teeth lose his buck teeth, get rid of the octopus decoration's in the bend of time, make the mystical knight's recognise guile as Magus in the battle if he's on the team, make the game not end in a huge cliff hanger.