Series obviously have cast of characters. Almost always, the protagonist is introduced in the Pilot. Sometimes they are much larger than the norm or/and given significant focus, role and development much like the protagonist. Cases like these often opts for Second Episode Introduction. At the same time, the middle of the story is where crucial things happen. Major revelations and twists usually happen here, and it is also where the turning point of the story usually kicks in if not leads to, and often times this character is a major part of those.
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- Mobile Fighter G Gundam has a mecha example. The eponymous God Gundam makes its debut in Episode 24, while the main characters' most consistent Sixth Ranger, Allenby Beardsley, is introduced in Episode 30. The series has a total of 49 Episodes.
- Mobile Suit Gundam Wing has another mecha example. The (second) eponymous mecha that will serve as The Hero'snote Bigger Stick makes its debut in Episode 24. The series has a total of 49 Episodes.
- Mobile Suit Gundam SEED introduces Murata Azrael, one of its three Big Bad Ensemble, in Episode 38. The series has a total of 50 Episodes.
- Mobile Suit Gundam 00 plays with this . The 50 episode series is divided into two seasons (plus a movie) with 25 episodes each. For specific examples, the first season introduces Kati Mannequin in Episode 13, Team Trinity in Episodes 15 and 16, and Regene Regetta as the Last Episode, New Character. Season 2 introduces both Mileina Vashti and Andrei Smirnovare in the premiere while the rest of the Innovades are introduced throughout the first half.
- Mobile Suit Gundam AGE also plays with this due to it being a Generational Saga of three protagonists with their own Story Arcs. The overall main story has four parts with the last one being shared by the three and has a total of 49 Episodes. Second generation protagonist Asemu Asuno and his rival Zeheart Galette were both introduced in Episode 16, while third and final protagonist Kio Asuno was introduced in Episode 29.
- The Hunger Games trilogy introduces main characters Johanna Mason, Finnick Odair, Beetee Latier, and Plutarch Heavensbee in the second book, Catching Fire.
- Game of Thrones has a total of eight seasons.
- The fourth introduces several major characters: couple Oberyn Martell and Ellaria Sand (whose appearance have officially introduced Dorne in the story), Mace Tyrell (Lord Paramount of the Reach and the King's Father-in-Law), The Three-Eyed Raven (essentially the series' Big Good), and the Night's King (the series' Big Bad and Ultimate Evil).
- The fifth introduces several major characters as well: The Waif (Arya Stark's sempai and rival) and Wun-Wun (the last known living giant who will be integral on the Starks battle in retaking Winterfell).
- In How I Met Your Mother, the titular mother's roommate Cindy is introduced during the middle of the fifth season, which is the middle of a nine-season long series. She will serve as the catalyst for why The Hero will ultimately meet his future wife.
- Orphan Black:
- Delphine Cormier and Aldous Leekie are respectively introduced in Episodes 5 and 6 of a ten episode season. The former is one of the main character's Love Interest (and a main character herself) and one of their most powerful allies, while the latter is the Disc-One Final Boss.
- The supposedly Posthumous Character Ethan Duncan is revealed to be Not Quite Dead in the sixth episode of the similarly ten episode second season. He created the main characters and is the adoptive father to one of them.
- If one considers the overall five seasons, then main character Charlotte Bowles is the Last Episode, New Character in Season 2, while prominent antagonists Ferdinand Chevalier and Virginia Coady, as well as main character Krystal Goderitch, are all introduced in Season 3.
- Main character Agron makes his debut in the eight episode of the inaugural season, which is thirteen episodes long.
- Main character Gannicus is introduced as the protagonist of the prequel season following the first.
- If one considers the overall four seasons, then there's main character Nassir, who got a Second Episode Introduction in the third season.
- The Walking Dead:
- Breakout Characters Daryl Dixon and Carol Peletier are both introduced during the series' third episode. The inaugural season only has six episodes.
- The mid-Season 3 finale introduces main characters Tyreese and his sister Sasha. The season is sixteen episodes long.
- Man characters Abraham, Eugene and Rosita made their debut in the following episode after the mid-Season 4 premiere. The season is sixteen episodes long.
- Man characters Aaron made his debut in the following episode after the mid-Season 5 premiere. The season is sixteen episodes long.
- Man characters Jesus made his debut in the following episode after the mid-Season 6 premiere. The season is sixteen episodes long.
- Ultimecia, the Big Bad of the four-disc game Final Fantasy VIII, is officially introduced in the story at the very beginning of Disc 3.
- The four-disc game The Legend of Dragoon introduces party member Meru in Disc 2, while the very last party member, Miranda, is introduced at the beginning of Disc 3.
- Metal Gear makes it tricky due to the franchise having three different protagonists.
- The Solid Snake saga covers five games. His (and the overall series') third game introduces the series' Breakout Villain Ocelot, Solid Snake's best friend Hal "Otacon" Emmerich, Wild Card Naomi Hunter, The Cutie Mei Ling, the first resident Action Girl (though not initially) Meryl Silverburgh, resident Butt-Monkey Johnny Sasaki, and the other iconic villains Psycho Mantis and Liquid Snake (the latter being the protagonist's twin brother).
- The Naked Snake/Big Boss saga covers four games. His third game introduces Otacon's would be parents Huey Emmerich and Dr. Strangeglove.
- The Parasite Eve series has three games. The second introduces The Hero's Love Interest Kyle Magdigan as well as her adopted sister Eve. The latter eventually becomes the protagonist of the third due to Body Surf.
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