One idea could be a story where Mash teams up with an unlikely ally from a rival school. They start off not getting along but through various challenges, they learn to work together and combine their unique skills.
Another option could be a student from a different magic school who is jealous of Mash's popularity and unique abilities. This student could use dark magic to try and bring Mash down.
The last episode of the Magic Racing God was as follows:
As the competition progressed, the strength of both sides got closer and closer. In the end, after a fierce battle, the Racing God and the Mechanical Enemy finally met.
The mechanical public enemy fearlessly challenged the racing god and the two sides began a soul-stirring game. However, the Racing God was not intimidated by the powerful strength of the Mechanical Enemy. He bravely welcomed the attack of the Mechanical Enemy and continued to push forward.
In the fierce battle, the racing god discovered the weakness of the mechanical public enemy and used it to successfully defeat him. In the end, the racing god won and defeated the mechanical public enemy to save the world.
At the end of the game, the racing god and the mechanical public enemy shook hands and said that the battle between them was just an accident and there was no need for them to fight each other. Racing God said that his victory came from his wisdom and courage, while Mechanical Enemy humbly said that his victory was only due to his mechanical device.
From then on, the racing god and the mechanical enemy became good friends and started a new journey together to bring more peace and progress to the world.