So basically a bunch of characters from anime and cartoons suddenly find themselves in limos, with instructions to head to their rooms when they arrive. The Limos arrive at a Hotel. When all the characters are organized in their rooms they are asked to come down to the lobby, where they all meet.

Anime include:
Pokemon
Rosario vampire
To love Ru
MY hero academia
Familiar of Zero
Digimon
Kanokon
Squid Girl
Monster Musume
Sekirei
Date A Live

Cartoons:
Steven universe
Avatar the last air bender
RWBY
Danny Phantom
Ben 10
Generator Rex
Sonic(comics as well, I like the new characters like Whisper and Tangle)
Monster high
Ever after high

Shows:
Kamen rider Kabuto
Kamen rider Ryuki
Kamen rider Den-O
Kamen rider Kiva
Kamen rider decade
Kamen rider W
Kamen rider OOO
Kamen rider Fourze
Kamen rider Wizard
Kamen rider Gaim
Kamen rider Drive
Kamen rider Ghost
Kamen rider Ex-Aid
Kamen rider Build
Kamen rider Zi-O