The three main (canon) characters of the mega crossover. They have come to New York thanks to Madoka's invitation to celebrate and meeting new people.
- Id Superego And Ego: Tsugumi is the Id, Ayase is the Superego, and Shu is simply the Ego.
- Legacy Characters: These are the fictional characters that inspired the author (alongside others) to imagine their own versions of said characters.
- Older and Wiser: Have this trait since their war with the original GHQ, yet retain their own personalities.
- Retired Badasses: They have retired from their duties and let their Lost Kingdoms versions take over the roles.
Back to Shinnen New Year.
- Daath, no matter what it takes, we will stop you.
Voiced by: Austin Tindle (EN), Yuuki Kaji (JP)
The main character in his perspective of the crossover story. Years after he save the world from the Fourth Apocalypse, he is now blind due to Inori's sacrifice and traumatized since his experiences. Married to Ayase, he and his friends are visiting New York to celebrate New Years alongside meeting an alternate version of himself. Shu wonders if there are more things to interact.
- Artificial Limbs: His former right arm.
- Broken Pedestal: Sees himself as this ever since his anime ended.
- Cool Shades: Wears one in the first half of the story.
- Dual Wielding: He uses Kirito and Asuna's sword voids.
- Expy: His role is similar to Cloud from Advent Children with all the brooding attitude to boot.
- His blindness is similar to Matt Murdock/Daredevil.
- When regaining his powers, his role in reclaiming his throne is being the T. rex.
- Handicapped Badass: He's blind and wears a prosthetic arm, but is remembered as a savior to some people.
- The Hero: Of his respective anime and this story, although in a more deconstructed case.
- My Greatest Failure: When he failed to be with Inori in the afterlife.
- One Last Job: Since he temporary regains his powers, him helping the united forces against GHQ/Da'ath is his sole chance to confront his past.
- Shell-Shocked Veteran: He becomes one since the events of the anime and by missing Inori.
- Thousand-Yard Stare: Develops this at the beginning of the story.
- Took a Level in Badass: He becomes stronger after temporary regaining his powers.
- Shinomiya Ayase is back on the battlefield!
Voiced by: Emily Neves (EN), Kana Hanazawa (JP)
The main heroine and Canon!Shu's 'wife'. Formerly a notorious member of Funeral Parlor, she has since settles down to enjoy the New Year times. She remembers the time when her disabled legs made her a burden, yet she does everything she can to help her comrades.
- Ace Pilot: She is formerly a skilled Endlave pilot.
- Characterization Marches On: Here, she is shown to be relax despite retaining some of her young toughness. Ayase is also shown to be worried to Shu's well-being since their first interaction.
- Disabled Love Interest
- Expy: Of Tifa.
- Her appearance remind some people of Barbara Gordon/The Oracle.
- Handicapped Badass
- Heterosexual Life-Partners: With Tsugumi like in the old days.
- Intergenerational Friendship: Develops one to Asuna Yuuki.
- Tomboyish Ponytail: Still wears one in her adult years.
- Took a Level in Badass: With a new Endlave and yearly experience, Ayase becomes a much stronger pilot.
- Violently Protective Girlfriend: The first chapter shows her attempts when two Tennouzu classmates threaten Shu.
- A happy ending. Granted we never truly got one, but at least this time we gotta make something up.
Voiced by: Monica Rial (EN), Ayana Taketatsu (JP)
Shu and Ayase's other main friend that she goes along with. Formerly the hacker of the original Undertakers, she has settle down with her friends to celebrate the New Years. She has meet her cat girl version of herself who she gets along with.
- Animal-Eared Headband: Still wears her signature cat-ears.
- Bratty Half-Pint
- Cat Girl: Acts like one in her life.
- Cuddle Bug
- Cute Bruiser
- Expy: She may be an expy of Yuffie given the Final Fantasy VII references.
- Heterosexual Life-Partners: With Ayase like in the old days.
- Intergenerational Friendship: In Chapter 2, she gives a nice compliment to Leafa since both share the same Japanese voice actor.
- Maid and Maiden: Acts like one to Ayase.
- Mission Control: Back when she was part of the original Undertakers.
- Token Mini-Moe: The youngest of the main Guilty Crown trio.