Some Final Fantasy sign start out mysterious, but their backstories grow over time. Auron from Final Fantasy 10for example, opens with Tidus in Zanarkand, disappears for a while, then reappears without saying much, but by the end of the game he turns out to be an important part of how everything comes together.
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Other Final Fantasy characters, including those specifically derived from Final Fantasy 10is underutilized. They may have a cool debut or design, but the following examples only doesn't amount to anything really exciting or memorable. The only thing that makes these characters compelling outside of their games are fan theories.
There will be spoilers for all games listed.
Who is that character?

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Edward Chris Von Muir
This prince is a popper
Edward is one of the rotating party members of Final Fantasy 4a game that never settles until the very last round of dungeons. He is an early addition, the prince of Damcyan who eloped with Anna, the daughter of a powerful mage named Tellah.
When they escaped, Anna was tragically cut down, and Edward was too cowardly to do anything about it, leading to a big confrontation with Tellah. Edward is a Bard, and not very powerful, so he's not a great party member, and he doesn't grow up to be a great character later on. The game doesn't do enough to redeem Edward and then just forget about him in the end.
Gogo
Who is that?
Final Fantasy 6 has one of the largest playable character lists in Final Fantasy history, and not everyone gets their time in the sun. Gogo is a good example of an optional character appearing in the latter half of the game. Gogo lives inside a monster, and he barely speaks when he meets him, and then not much after that either.
He is a Mime class, meaning he has no original talents of his own, but players can take advantage of his copy ability to deal significant damage in battle. Because he is so shrouded, there are theories about his existence, such as the remains of Emperor Gestahl, Daryl, who has a connection to Setzer, or Baram, who shared a connection with Shadow. The fan theories may be compelling, but the game itself drops the ball on making Gogo important.
Rashard Zangan
Tifa's Fighting Coach
Zangan is a supporting character in Final Fantasy 7 and Tifa's martial arts teacher. Players meet him when Cloud tells his background about being a SOLDIER while the party stays in Kalm. In the flashback, Zangan is found in Nibelheim's Inn and after Sephiroth's attack, he is seen saving people during the fire. But in retrospect, that's all.
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Final Fantasy 7 giving him a little more time inland Final Fantasy 7: Advent Children depiction of the event, along with remaking his scenes in Final Fantasy 7 Rebirth. For such an important connection to Tifa, even the remake doesn't do enough to showcase how powerful Zangan is supposed to be. Hijacked heroes always deserve more time to shine, and this one is no different.
The black waltzes
Abracadabra And Gone In A Flash
There are three Black rollers in Final Fantasy 9, and they serve as the villains for the game's first major arc. Unlike the other factory-made Black Mages, Black Waltzes have more unique talents and are stronger. Black Waltz 1 is found in the Ice Cavern, Black Waltz 2 is encountered when trying to leave the airship field in Dali, and Black Waltz 3 pursues players in their airships.
All three boss battles are iconic in the game and also help fill in more about another party member, Vivi, but after all three are defeated they are never mentioned again. Since they play such a key role so early in the game, players can expect more from them.
Tidu's mother
A broken home
Tidus is the main character in Final Fantasy 10. He has a lot of daddy issues with his dad, Jecht, who obviously gets a name, a cool character design, and a significant part in the story surrounding his and Tidus' past. Tidu's mother looks like a normal female NPC, and the creators didn't even bother to give her a name.
Canonical is her name “Mother of Tidus”, and she appears in a few flashbacks throughout the game. She died of an illness or a broken heart, as Tidus believes, when Jecht left the family, which is a major reason why he hates his father so much. The game spends a lot of time building on this hatred and the connection that Tidus and Jecht share, so it only felt like the mother would have some kind of late-game presence that Jecht does. Instead, even though she is Tidus' main motivation, we never really learn anything about her.
Rex
Oh no bro
Rex is the first playable character in the Final Fantasy 12and he seems set to be the main character. During a night siege, players fight their way through a castle dungeon, and at the end, Reks is betrayed and dies. Reks is the brother of Vaan, the actual main character, who resembles him quite a bit. When a family member is killed in a story, it usually drives someone towards revenge or answers, but Rek's death doesn't mean much to Vaan.
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Reks might as well not even be related to Vaan. That's how much he means to him beyond a few select scenes. It's one of those opening set-ups that seems like it'll pay off later in the game, like when Reks comes back as someone else, but beyond the twin complex between Basch and Noah, he's completely unimportant to the rest of the story.
Lunafreya Nox Fleuret
Your princess is in another game
Lunafreya is the promised bride of Noctis, the protagonist of Final Fantasy 15. The two never really share a scene together as the entire journey revolves around Noctis traveling to Lunafreya before the Empire can take her out. Unfortunately, she must sacrifice herself to save her city, ending the couple's wedding plans early.
There were plans to give Lunafreya more story time through her own DLC adventure, but that project was canceled, along with several other character-focused DLCs. Lunafreya is definitely an important character in the story that helps move the plot forward, but it's not enough either, as she dies just as things start to get interesting. It would have been nice to see what the team had planned for Lunafreya in her DLC.
Argath Thadalfus
Of Broth And Beans
Argath is a major character and party member in the early chapters of Final Fantasy Tacticsbut controlled only by AI. Argath is a nobleman who happens upon Ramza and Delita and decides to join their band of knights to restore honor to his name. He turns into a villain at the end of the first arc, going so far as to kill Tietra, Delita's sister, as he sees both characters as common street trash beneath him.
This causes a ripple to form between Delita and Ramza, so you could say that Argath gets a big theme in the plot. But he also dies in this battle and does not come back. Tactics has a bit of a villain problem, as there are far too many and no central one to really hate or focus a story around. Argath could have been that villain, one as iconic as Sephiroth from Final Fantasy 7. Instead, he is just one of many.
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