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This RP is basically: Harry Potter, crossed with Yu Gi Oh, crossed with Animorphs, Neopets, and maybe some Yu Yu Hakusho.

It is mostly set in the realm of the Animorphs, save for a small part at the beginning, which is set in the HP Realm. It is set before Dumbledore died and after Voldemort re-rose. It might have a few side trips back to the HP realm and a few to the Neopets realms, and maybe one to the YYH realm (Whose people are only there to guard the gates), and maybe Yami might be returned at the end, if we haven't broken him and Yugi by the time that happens.

The Shadow Realm exists, as does Demon World. HP is another Realm, attached to the Animorphs one. Neopia exists within the HP Realm, they just never notice it.

Events occurred that caused Dumbledore to send a few wizards in an attempt to keep the borders between realities within existence and the Yeerks within the realm of the Animorphs.

And he wants the borders separate because the Yeerks might promise Voldemort elimination of all muggle-born Wizards in exchange for his help. He wants the Yeerks to stay within the realm of the Animorphs. They have only made three excursions into the HP realm but they were caught by 'friendly' wizards each time and forcibly removed, memories also erased (beyond the Yeerks capability to regain them.) He wants them to stay out of the HP realm due to the fact they might ‘control’ a few of the fledgling wizards, thus gaining the opportunity to cause a LOT more damage.
The Yeerks have made no contact with Voldemort as of yet. They don't know he exists, and he doesn't know they exist, and Dumbledore also wants to keep it that way. So he collaborates with other schools in an attempt to find a magical solution. Or at least a solution… and, while messing around with magic, they accidentally summon Yami Yugi+ Yugi Moto from where they were sleeping in the Demon Realm, having been drawn there by a few of the higher leveled demons of the Demon Realm.
The other schools collaborated with Dumbledore because the Yeerks that invaded hurt a few of their students, and it was THEY who contacted him.
They, working together with Yami and the Neopians, made it so that the Border Breaks (otherwise known as ‘Portals’) to the Animorphs Realm only occur in three places, each one in a small forest within eastern England.
When they summoned Yami and Yugi, they disturbed the magical elemental alignments of the HP and Demon Realms. That caused certain Neopian denizens to suddenly notice them.
The mages (like Jerdana) and faeries (Like Fyora) sensed the disturbance in the magical alignments around the Animorphs Realm, and sent a few people there to talk (find out what was happening). They found their way to Earth, discussed with the wizards, who were trying to figure out how to make the 'portals', made the portals FOR them, tied a portal to Neopia with those other portals to a small forest within eastern England, and when they left, they left behind a few people to guard the portals and discuss magic with the wizards.
The wizards, mages, and Faeries got together and set up a place where they could each learn magic styles from one another, because they believe that adaptability is good.
At least one of the Yami Group (more information available on the YG later) was one of the Neopians. All of the Neopians that went know magic of some kind, even so small as to light candles or create breathable air!

The Yami Group are the wizards and Yami and Yugi that were sent to guard those holes. A phoenix gets VERY attached to Yugi on his way to the portals (cause if he gets separated from Yami... well. Let's not go there, kay?) As a side effect of being in such a highly magical environment, Yami can do a 'separate solid relatively real body'.. but for only up to three hours at a time before having to take a hour-long break from it.


PLOT (After/Before)?
So, the Yami Group makes their way towards the Portals. When they get there, they are told by the small group of Wizards On Duty to guard those portals or stop the Yeerk Invasion. They choose the former.
And then, while guarding the Portals, they meet a few YYH people guarding their end of the Portals... and those people convince the Yami Group to fight the Yeerks. The YYH people are capable of guarding those portals. But they aren't very mobile compared to the Yami Group. Hiei is sent with them, to find the Animorphs (cause the Animorphs are good at hiding…)
Kaiba gets thrown into the Animorphs Realm at the same time Yami gets summoned from DR, stays hidden, and finds the Animorphs before the Yeerks find him! The Andalite convinces him to help them, and he meets the Chee, and they discuss holograms!

And Bat's tagging along because she and Marie are inseparable. And Tobias promised to teach her how to land. Yes, she's a Korbat. She can fly perfectly, but can't land to save a life.

The YYH people (that didn't go) send a person or two to learn magic styles and teach them at the place that the Wizards and Neopians meet....
And a few of the easy-to-learn magics get taught to those that don't know them.