Raven and Starfire from Teen Titans dressed as Swordcraft Academy students.
Technically they are supposed to be Ronie and Tiese from Sword Art Online Alicization but since all the students basically dressed the same way, there wasn't much difference anyways. At least we know that Riaos and Humbert will not fuck with them....ever.
Feel free to suggest more ideas down below if you have anything interesting you wanna suggest for Crossovers.
