A list of characters found in Ace Combat 04: Shattered Skies.
The Independent States Allied Forces, an international military alliance of Usean countries opposed to Erusea's expansionism.
- The Alliance: Multiple nations united against Erusea, though specific borders are not shown in briefings, and instead limited to "ISAF territory" and "Erusian territory".
- Back from the Brink: In the beginning of the game, ISAF has lost most of its territory due to Stonehenge blocking their air force from operating in most of the mainland. Their only territory shown in the initial briefing include North Point, various other islands, and one mainland territory: St. Ark. With the aid of Mobius One, ISAF eventually liberates all of their territory and even takes over the Erusian capital of Farbanti.
- Fantasy Counterpart Culture: Very similar to the real-world North Atlantic Treaty Organization, another military alliance with a four-letter acronym. The ISAF and NATO flags are both white emblems over blue backgrounds, highlighting the similarity.
One of ISAF's fighter pilots, and later their top ace. Mobius 1 returns as the playable character for Ace Combat 7's VR missions, now affiliated with the IUN and fighting another Free Erusea movement in 2014.
- Ace Pilot
- Featureless Protagonist: Mobius 1 is a man. That's all we know about him.
- Hero of Another Story: He's involved in anti-Free Erusea ops with the IUN in Ace Combat 7, a campaign that is totally unrelated to the main game.
- Hope Bringer: After destroying Stonehenge and shooting down a Yellow Squadron member for the first time in Mission 12, Mobius One becomes a symbol of strength for ISAF's military. Erusian forces have the opposite reaction
- Living Legend: As the one who spearheaded the liberation of the Usean continent from Erusea, he already becomes this before 04 ends, to say nothing of his reappearance nine years later for 7's VR campaign. Allied pilots have a hard time believing it's really him.Omega 11: I hope this guy's the real deal.
AWACS Sky-Eye: You'll find out if he is soon enough. Everyone will.
- One-Man Army: As tradition for Ace Combat player characters, but he especially embodies this trope due to the fact that, unlike many others, he does not fly with any wingmen for the entirety of the game. Though he is accompanied by a "Mobius Squadron" in the final level, they do not behave any differently than regular ISAF pilots.
- Old Soldier: By the time of the VR missions in 7 he's been on active duty for 10 years. Viper 2 even calls him an "old timer". Perhaps he's the reason Erusea hasn't gone anywhere near North Point in the main game.
- Parental Abandonment: Additional media on the website states that his parents were killed in an Erusian bombing.
- Previous Player-Character Cameo:
- In 5 and 7, as the protagonist of respectively Operation Katina in the former and the VR missions of the latter.
- He also gets a brief appearance in Zero as the True Final Boss of The Gauntlet.
- Weapon of Choice: In nearly all promotional material, he is seen with an F-22A Raptor, which becomes available to the player in the last two missions of the game on a normal playthrough. When he returns as player character in Operation Katina, it's his only available plane for a first playthrough. His livery, complete with ISAF emblems, is available in nearly ever game after 04.
- Worthy Opponent: Yellow 13 views him as this as the game goes on.
The AWACS assigned to Mobius One.
- A Birthday, Not a Break: Downplayed somewhat, since both events are important victories for ISAF rather than a negative event. During Mobius One's first operation, intercepting a squadron of bombers, he mentions it's his birthday. One In-Universe year later, during the capture of the Erusian capital, he brings up his birthday again at the start of the mission.
- Mission Control: Is responsible for command and control during various ISAF operations, mainly the missions undertaken by Mobius One. He later returns in the same task for the IUN.
A large western nation of the Usean continent with a ultranationalist government and the main opposing force for the game.
- The Empire: By the beginning of the game, they have secured most of the Usean Continent, and nearly destroy the last remnants of ISAF in the first mission.
- A Nazi by Any Other Name: It's ambigous, since the inner workings of Erusea's government are never seen. Multiple characters, including ISAF allies and at one point the narrator, call them "fascists" as an insult. The narrator mentions a "secret police", and local law enforcement being replaced with Erusian military police.
- The Remnant: The briefing for the final mission describes the enemies as a "group of young Erusian officers", who have presumably ignored Erusea's surrender in their act of taking over Megalith.
- A more clear-cut example, called Free Erusea, are the main enemy of Operation Katina.
- Would Not Shoot a Civilian: Averted several times during the story. At one point, several fighters are sent to shoot down two passenger planes because they both have defectors onboard. Later on, bombers are also tasked with attacking a just-liberated city with the intention of destroying the allied forces there without any regard shown for civilian casualties.
Erusea's top ace, and leader of Yellow Squadron.
- Ace Pilot: Mobius One's most formidable adversary, with sixty-four confirmed kills in his first appearance. Makes sense since he was mentored by Mihaly Shilage himself.
- A Father to His Men: As noted by the narrator, 13 prided himself not on his kill record, but on the fact that he never lost any of his wingmen in battle. This ends during the destruction of Stonehenge.
- Anti-Villain: He's show to be quite an honorable man, in spite of being the closest thing the game has to a Big Bad. Over the course of the story he shows care for his wingmen, dislikes cowardice in battle (especially sabotage), pities the weaker enemies he shoots down, and derides the army's tactic of hiding AA guns on top of hospitals.
- Early-Bird Cameo: Shows up as one of the optional Aces in Ace Combat Zero: The Belkan War
- Worthy Opponent: Longs to have one of this, and eventually comes to see Mobius One as this. The narrator speculates that it brought 13 great joy when he and Mobius finally fought, even if it resulted in the former's death at the story's conclusion.
Yellow 13's most trusted and devoted wingman, determined to keep him safe both in the air and on the ground. She is the first Yellow Mobius One shoots down.
- Ace Pilot: It comes with being the Yellow Squadron's second-in-command. She was apparently trained from a young age by Thirteen himself.
- Ambiguously Brown
- Brooding Boy, Gentle Girl: The Gentle Girl to Thirteen's Brooding Boy.
- But Thou Must!: No matter which plane you target during the Stonehenge raid, it will invariably be hers. And you have to shoot one of them down to complete the mission.
- Child Soldiers: Thirteen says he started training Four to be a fighter pilot when she was still a young girl.
- Clingy Jealous Girl: Given how protective she is of Thirteen in any situation, and how long she's known him, it's no stretch to imagine that she's probably a bit possessive of him. Which of course frustrates the barkeep's daughter.
- The Quiet One: She doesn't have any lines in the whole game and she comes off as being generally a very quiet person.
- Silk Hiding Steel: Wears a military-style pencil skirt, apparently carries around a perfumed handkerchief, and drinks from what appears to be a porcelain teacup, all the while possessing a gentle and subdued demeanor. But let's not forget that she's also a career soldier and ace pilot who has probably killed her fair share of enemy pilots and soldiers in the name of her country.
- The Smurfette Principle: Stated to be the only female in Yellow Squadron, and is one of the only two female characters in the story.
- Worf Had the Flu: Her plane is in terrible shape when you shoot her down.
Erusea's most elite squadron, led by Yellow 13.
- Ace Pilot: They are notable much more threatening than standard Erusian pilots, even demonstrating the capability for advance manuevers like Pugachev's Cobra.
- The Dreaded: Feared greatly by ISAF at first, so much so that the initial response to them showing up during a strike on Erusea's oil supplies is an order for all planes to flee immediately. Over the course of the game, however, they begin to lose this reputation as Mobious One slowly but surely begins to whittle down their numbers. By the second-to-last mission, the order given to Mobius One is to shoot them down on his own, despite being outnumbered. Mobius One successfully complies.
- Lowered Monster Difficulty: Over the course of the game, Yellow Squadron's veteran members are moved to other units as ISAF begins to regain territory, leading to less experienced pilots to join the squadron. In the first appearance, they cannot be shot down by any means. In their final appearance, they are essentially slightly more skilled standard pilots. Justified by that point, because the Yellow squadron faced at Megalith are regular radical Erusean pilots who painted their planes in Yellow livery to honor their fallen comrades.