Superhero Packing Heat: Odin is the only character who can use guns which compensates for the fact he can't use magic.
What an Idiot: While Odin had the foresight to hunt Medusa with a medicine that cures petrification, he gave it to a creature incapable of opening the bottle!
What Happened to the Mouse?: Despite being a main character in this game, he's never mentioned again after this game; only seen in flashbacks in PSIV. By comparison, Alis is constantly referred to throughout Algo's history and Myau and Lutz show up in future games.
Crutch Character: Alys is much more powerful than the other early game characters at first, but even leaving aside the fact that you lose her after her Plotline Death, her growth curve is such that other characters quickly catch up if you level grind.
Decoy Protagonist: Considering how similar her name is to the protagonist of the first game, you'd think she was the main character, wouldn't you? Beside, she's usually swapped into the first character slot when she joins and acts like a leader.
Crutch Character: When he first joins the party, he's usually ten levels stronger than your highest-leveled character (unless you did some level grinding). This also applies when he rejoins the party, though it's not as pronounced.