as much as i like the idea of Schala joining the party it would completely mess with a certain ending, and mess up the plot of Chrono Cross, so that is a no go... i would have to say The Great Explorer Toma, Toma pouring his drink on his own grave would make for a pretty funny situation, but because of that i guess Toma isn't a good idea either... i guess if you want someone that wouldn't mess with the story in any way a good choice would be the Knight Captain of The Knights of the Square Table, just be able to recruit him after giving him the Jerky from his brother and no story sequence could have been messed up then, of course he would have basic knight skills normaly found in RPGs, maybe varoius elemental sword techs that don't require a double tech to pull off like Flame Sword, Ice Blade, & Lightning Blade, of course they could be used in Double Techs like Flame Sword + Ice(1,2,3) for an Antipode Blade...