Party

A party is a battle mechanic in the series.

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Shin Megami Tensei III: Nocturne

The Demi-fiend's party is consisted of himself and three Demons. These Demons are fixed upon entering a battle and cannot be swapped, so one must pre-configure any demons before engaging in combat. Defeat of the Demi-Fiend will result in a Game Over.

Shin Megami Tensei: Strange Journey/Redux

The protagonist's party consists of the protagonist himself and 3 extra Demons. He may use up a turn to swap extra combatants. The protagonist's defeat will result in a Game Over.

Shin Megami Tensei IV

Flynn's party is consisted of himself, three Demons and a partner. Before the alignment lock, at the start of each battle, one out of Jonathan, Walter and Isabeau will be chosen randomly as a guest ally with their own movepool and HP bar. After the alignment lock, only either one of Merkabah (Jonathan) in Law, Lucifer (Walter) in Chaos and Isabeau in Neutral can be used.

Flynn may also use up 1.5 Press Turns to switch a combatant into another. If the whole active party is killed, it will result in Charon requesting a fee to revive him. If he doesn't pay, it will trigger a Game Over. Flynn may also choose to revive himself without paying the fee, although this will result in Charon accumulating debt on him.

Shin Megami Tensei IV Apocalypse

Nanashi's party is consisted of himself and three Demons, alongside a human partner that he may configure on his own. He starts with Asahi and may later recruit Nozomi, Navarre, Gaston, Toki, Hallelujah or Isabeau to use in battle. In any difficulty but Apocalypse, the party will only be considered defeated if the whole party is wiped out. In Apocalypse difficulty, if Nanashi is knocked out, the party is automatically defeated. Being defeated in battle usually has no consequences, and Dagda may revive Nanashi for free or the player might stay in the Underworld. (Although Dagda cannot revive Nanashi during anywhere in the Cosmic Egg until the Massacre and Peace route confrontations are done for. Therefore, being defeated in that situation results in a regular Game Over).

If Nanashi accepts Merkabah's offer to join him and defeat Lucifer (And thus triggering a bad ending scenario), all party members will desert and Merkabah will be his sole partner during the upcoming confrontation against Lucifer. This is the only instance where Merkabah can be used as a partner in this game, despite Nanashi may use him as a summonable Demon during a New Game Plus.

If he reaches the penultimate floor of the Cosmic Egg and accepts Dagda's deal, all human allies will desert, although he may choose a partner to go with him after defeating VishnuFlynn. If his previous decisions are in favor with Dagda, rejecting his offer will result in him deleting all Demons within the current party and stock.

During the final battle against YHVH, Flynn will have a separate party on his own, consisting of himself and Satan (During Massacre Route/Accepting Dagda's offer) or Walter and Jonathan (During Bonds Route/Rejecting Dadga's offer), complete with their separate item pool.

Nanashi may use 1.5 Press Turns to swap a combatant into another. If the whole active party is killed, Dagda will revive him for free as a part of his pact, unless during the Cosmic Egg where his powers are sealed by Mithra-Buddha, where it will result in a Game Over instead.

Persona 3/4/5

In the Persona series from Persona 3 onward, a party is a group consisting of the Wild Card, and up to three characters who can support them in battle. If this Wild Card is knocked out, the game is over.

While it is usually impossible to swap out party members, the protagonist may use up his turn to swap out a party member with another in Persona 5 as a bonus of Hifumi Togo's Confidant. If the protagonist maxes her confidant, he may swap party members in any turn.

Persona Q

In Persona Q, the P3 hero is required in the party during the P3 Route, and the P4 hero is required in the P4 Route. If either are knocked out in their respective Routes, the game is over.

In Persona Q2, no protagonist is required inside the party, and the Game Over is triggered when the whole party is knocked out instead. The sole exception is Risky, where the P5 hero must be in the party and his defeat will result in an automatic game over. This makes Hama users significantly more dangerous, since the P5 hero (Arsène) is weak to bless.

Persona 5 Scramble: The Phantom Strikers

The protagonist is usually locked in the party, and three out of nine other party members may accompany him, with one, Zenkichi Hasegawa, only available later on. However, there are some scenarios where the protagonist is not required to be within the active party. Unlike past games, his defeat alone will not result in a Game Over. Instead, the game over triggers when the entire party is defeated.

Persona 3 / FES / Portable

Members

Yukari Takeba	Junpei Iori	Akihiko Sanada	Mitsuru Kirijo

Aigis	Koromaru	Ken Amada	Shinjiro Aragaki	Metis

Persona 4 / Golden

Members

Yosuke Hanamura	Chie Satonaka	Yukiko Amagi
Kanji Tatsumi	Teddie	Naoto Shirogane

Persona 5 / Royal

Members

Morgana	Ryuji Sakamoto	Ann Takamaki	Yusuke Kitagawa
Makoto Niijima	Haru Okumura	Goro Akechi	Sumire Yoshizawa

Persona Q

Members

P4 hero	Yosuke Hanamura	Chie Satonaka	Yukiko Amagi
Kanji Tatsumi	Teddie	Naoto Shirogane	P3 hero
Yukari Takeba	Junpei Iori	Akihiko Sanada	Mitsuru Kirijo

Aigis	Koromaru	Ken Amada	Shinjiro Aragaki	Zen & Rei

Rise Kujikawa	Fuuka Yamagishi

Persona Q2

Members

P5 hero	Ryuji Sakamoto	Ann Takamaki	Yusuke Kitagawa	Goro Akechi
Morgana	P3P heroine	Makoto Niijima	Haru Okumura	P4 hero
Chie Satonaka	Yukiko Amagi	Kanji Tatsumi	Teddie	Naoto Shirogane
Yosuke Hanamura	Yukari Takeba	Junpei Iori	Akihiko Sanada	Mitsuru Kirijo
Koromaru	Ken Amada	Shinjiro Aragaki	P3 hero	Aigis

Futaba Sakura	Rise Kujikawa	Fuuka Yamagishi