Dark Is Not Evil: Their elemental affinity seems to have no relation to their morality. At worst, a Dark-aligned main character can get some creepy equipment in the Bonus Dungeon.
Crutch Character: Their Dark/light alignment means that they're in a powered-up state exactly Half the time, which is very helpful early on. But by the end of the game, they don't have the vitality to last on the front line, and their spells aren't a good match for the back line.
Heroic Mime: As is typical for games like these. The diary entries with less character to them might have been written by them.
Mighty Glacier: Slow as hell with low MP regeneration, but hits hard when he does. Also has almost one and a half times as much health as anyone else, the best defense out of anyone else, and the second-best physical attacks.
Stone Wall: It's true, though. His defense and HP are the highest of the group, and he can cast a buff to improve it that much more.
Theme Naming: Like with named robots in the series. In the US, his name sounds similar to "Mocha", and in Japan, he's named Cafe Latte.
Token Romance: If you play a female character, he falls for the main character.
Determinator: He tries, anyway. Marches off into a giant forest alone, but collapses midway through and has to be picked up by the party. At the endgame, he reacts to the seemingly hopeless situation by shouting that they'll all keep going the way they have no matter what their limits supposedly are, until someone tells them to stop (by which he probably means gives them better directions).
Ship Tease: There are multiple scenes throughout the game that imply Pico has feelings for Sorbet. (Though it might just be that he thinks the best boy should be with the best girl.) To his credit, he does try to support her emotionally when she's falling into depression near the endgame, but can't really address her issues.
Corrupt the Cutie: A slow-burning example. She didn't take much notice of Kale's philosophy while pretending to work for him, but seeing the Crapsaccharine World for what it was after rejoining the heroes made her start believing it.
Guile Heroine: She tries to be this, joining the villain's side to get close enough to rescue his captives on her own. He sees through her gambit easily.
Kill It with Water: Notable out of battle, where almost all of her plotline magic uses involve putting out fires. Plus she literally does this to an otherwise unkillable monster.
Squishy Wizard: Probably the most shining example of the group. Best of all, all her back-row attacks do random targets. She's practically custom made for being in the back row, considering her invaluable ability to heal status effects.
Stepford Smiler: Tries to appear cheerful, but deep down she's hurting because she knows she'll be separated from her friends. Type A, mainly.