Here is another updated idea of my, I hope this will be the last but I'm deeply unsure.

This AU is supposed to be an upgraded version of my Cinos A+TOH Aftermath which is inspired by an AU concept DatKaijuFan24 created which Luz, Anne, Sasha, and Marcy were kidnapped by Randall Boggs before they end up in their respective otherworldly travel as they meet Mike & Sully as Randall and Waternoose travel to other universes thank to a Paradox Prism shard and make a new company in Sonic's univere as they were test subjects, Cinos have been in the Gravity Fall universe but never met Luz or Anne in this timeline (note that DatKaijuFan24 didn't make a story as it was a concept). Now I add 4 media as part of this AU which are the video game Genshin Impact and the four animes Demon Slayer, Nanbaka, School Babysitters, and Spy × Family  as Cinos had travel to their universes (he had relationship with Shenhe and unknowingly have a daughter named Grusia and also had a relationship with Seitaro).

During the 2nd Eggman Wars (also called the Metal Virus War) caused by The Chaos Councils, Infinite, and Malware, they drain every last Paradox Prism energy which they used to bring many allies like Steeljaw, Pythor, Randall, Lord Shen, Dr. Octopus, etc (as the Metal Virus continue to spread and turn humans, mobians, aliens, etc into Zombots. The New Resistance (also renamed the Freedom Fighters by an Metal Virus infected Sonic) but mostly Knuckles as he used a small weaken Paradox Prism shard as he mixed it Kraang Portals as he ally with the cast of My Hero Acedemia, Dragon Ball, & Next Avengers, two sources of the Paradox Prism caused an strange phenomenon as it caused people from 5 other universes. Mike & Sully joined Cinos' family as the Metal Virus have infected many when they visit kids as Monstropolis was quarantine by the CA while those who were infected were sent to the human world to live in Scaradise, an island that was home for many banish monsters which Sully's change it into a vocation spot for all monsters hidden away from human sight. They were forced to the joined the war as some of them become Zombots as a cure is almost impossible thank to Eggman created it to be impossible as he never planned it, not even Maria can make a cure as she agree it's impossible but both agree that the Chaos Emeralds can cured everyone. After the war and the death of Cinos' father Shane which change him deeply, the last of the Paradox Prism used to the cast of Dragon Ball, My Hero Academia, & Next Avengers back but for unknown reasons, the others can't go back as some kind of mysterious barrier of dark energy was there, unknown to everyone faraway Mephiles holding his own corrupted Paradox Prism created the the barrier as he destroy his crystal and disappeared. Now Cinos have three goals in his life: protect his family from future threats no matter what; avenge Shane's death by waiting for his chance to kill Infinite; and find the way to take every back to their respective home universe as now they are his new guests who were forced to join in matter battles in Cinos' adventures. Cinos promise that will bring them back to their home which he technically kinda did as he used the Super Genesis Wave to merge many universes into one as opposed to Vortech who want to restart many universe as it will erased Cinos from existence, him no longer messing and tampering with many of these universes' timelines.

Monster Inc.
Michael "Mike" Wazowski
James Patrick "Sully" Sullivan

Characters from Amphibia 
Anne Savisa Boonchuy
Sprig Plantar
Hopediah "Hop Pop" Plantar
Polly Plantar
Sasha Elizabeth Waybright
Grimothy "Grime"
Marceline "Marcy" Regina Wu
Andrias Leviathan
Ivy Sundew
Maddie Flour
Frobo
Olivia
Yunan Longclaw
Mr. "Bee" & Mrs. "Oum" Boonchuy

Characters from The Owl House
Luz Noceda
Edalyn "Eda" Clawthorne
King Clawthorne
Willow Park
Augustus "Gus" Porter
Amity Blight
Hunter
Lilith Clawthorne
Camila Noceda
Alador Blight
Vee
Masha
Emira "Em" & Edric "Ed" Blight
Raine Whispers
Darius Deamonne
Eberwolf
Collector

Characters from Nanbaka
Jyugo
Uno
Rock
Nico
Hajime Sugoroku
Momoko Hyakushiki
Mitsuru Hitokoe
Yamato Godai
Seitaro Tanabata
Enki Gokuu
Hitoshi Sugoroku
Kaguya
Tsukomo
Musashi
Liang
Upa
Qi
Trois
Honey
Ruka Gojou
Noriko Sanzou

Characters fron School Babysitters
Ryuichi Kashima
Hayato Kamitani
Maria Inomata
Yuki Ushimaru
Kotaro Kashima
Taka Kamitani
Takuma Mamizuka
Kazuma Mamizuka
Kirin Kumatsuka
Midori Sawatari
Yoshihito Usaida

Characters from Demon Slayer
Tanjiro Kamado
Nezuko Kamado
Zenitsu Agatsuma
Inosuke Hashibira
Kanao Tsuyuri
Genya Shinazugawa
Giyu Tomioka
Shinobu Kocho
Kyojuro Rengoku
Tengen Uzui
Mitsuri Kanroji
Muichiro Tokito
Gyomei Himejima
Obanai Iguro
Sanami Shinazugawa
Aoi Kanzaki
Sumi Nakahara
Naho Takada
Kiyo Terauchi
Senjuro Rengoku
Kanae Kocho
Tamayo
Yushiro
Makio, Suma, & Hinatsuru

Characters from Genshin Impact
Aether
Albedo
Alhaitham
Amber
Arataki Itto
Baizhu
Barbara Pegg
Beidou
Bennet
Candace
Chongyun
Collei
Cyno
Dehya
Diluc Ragnvindr
Diona Katzlein
Dori Sangemah Bay
Dunyarzad
Eula Lawrence
Faruzan
Fischl von Luftschloss Narfidort/ Amy
Ganyu
Gorou
Hu Tao
Jean Gunnhildr
Kaedehara Kazuha
Kaeya Alberich
Kamisato Ayaka
Kamisato Ayato
Kaveh
Keqing
Kirara
Klee
Kujou Sara
Kuki Shinobu
Layla
Lisa Minci
Lumine
Mao Xiangling
Mika Schmidt
Mona Megistus
Naganohara Yoimiya
Nahida
Nilou
Ningguang
Noelle
Paimon
Qiqi
Raiden Shogun/ Raiden Ei
Razor
Rosaria
Sangonomiya Kokomi
Sayu
Scaramouche/ Wanderer
Shenhe
Shikanoin Heizou
Sucrose
Tartaglia/ Ajax (RN) or Childe (CN)
Teucer
Thoma
Tighnari
Vennessa
Venti/ Barbatos
Xiao (Alatus)
Xingqiu
Xinyan
Yanfei
Yao Miko
Yaoyao
Yelan
Yun Jin
Zhongli/ Morax

Characters from Spy × Family
Loid Forger/ Twilight
Anya Forger
Yor Forger
Bond Forger
Damian Desmond
Max
Becky Blackbell
Wiesel
Fiona Frost/ Nightfall
Yuri Briar

Note
This AU also have Cinos' and Shenhe's daughter Grusia there too and she hang with sisters