>>54254869>Sure palRyo, protagonist of a few wonderswan games is a part of the Adventure universe, making a cameo in the first movie, and a cameo during the second season 02, he would go on to be sent over to the Tamers universe, at some point he also meets the manga version of Tai, most likely before he gets to Tamers
Digimon World Re:Digitize's 3DS rerelease introduced the character of Rina, and in general the character of Mirei, they both show up in the game Digimon Story Cyber Sleuth, its a straight up plot point that you have to find a a way to go to another universe, and that's where you find Rina, you an also optionally help the female protag from the second DS Digimon Story game, who's also from her own universe
Digimon World Re:Digitize allows you to battle all the anime protags up to that point
In the PSP retelling of Adventure, Tai can meet all the anime protags up to that point, and team up with them
In Digimon World Next Order both Mirei, Rina and now the protagonist of Digimon World 1 show up in the game, and World 1's protag makes it pretty clear he's not from this universe
In World Next Order, Meicoomon from the Adventure Tai movies ends up there for a set of side quests
The Tai from the reboot anime meets his manga counterpart and teams up with him in a one shot
During one of the DS Digimon Story games you can meet and battle characters from the fifth anime series, and also the manga that was going on around that time as well
Digimon goes much harder on the multiverse concept
