I have tried to do this in the past, but I'll try again. What I want to do is make a "Chrono Cross tree" of sorts to try and fit as many characters into the main story as possible.
The starting point is obviously Kid, since she is what links Chrono Cross with Chrono Trigger. Then it would move to Lynx and Harle, and then to Serge. From Lynx, there would be branches to Norris and the Porre army and another to the Acacia Dragoons: Viper, Glenn, Riddel, Radius, Karsh, Zoah, and Marcy. From Marcy it branches to Nikki, Irenes, and Fargo. There is also a branch somewhere to everyone who lives in Guldove. Serge has a branch to Leena. Karsh and Glenn have a branch to Zappa.
Now, the characters who obviously have no place include but are not limited to: Poshul, Mojo, Luccia, Pip, Turnip, Neofio, Greco, Razzly, Skelly, Draggy, Pierre, Van, Funguy, and Sneff. -CSM