Yuri's always had a sense of humor.

Academia let him have fun, but the place itself was often boring and dull.

So he amused himself by laughing at the stumbling newbies, at the puffed up upperclassmen he took down in a flash.

Those things were hilarious enough on their own, but that was only barely scratching the surface.

The biggest joke was him; they made him a weapon, but now that the war was over, he was absolutely useless.