...A werewolf.
"Well, all i have to do is wait until nighttime." he said.
OF COURSE, HE KNEW WEREWOLVES ONLY APPEARED ON A FULL MOON, AND TODAY WASN'T A FULL MOON, BUT HIS FORMULA WOULD turn him into a werewolf when night came; REGARDLESS if there was a full moon or not.
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Finally, night came.
and then, his werewolf tf was to start.
Jonathan, wh owas on the sofa reading at the time, suddenly got up, and started taking off his clothes, stripping down to his birthday suit.
He saw his left hand beginning to change into something larger, with gnarled fingers, with his fingernails replaced with sharp white claws.
and the same thing happened to his right hand too.
He dropped to his knees, then to all fours, as his feet began to stretch longer than usual.
thick fur in the colour of his chestnut brown hair grew all over his body, and his spine pushed out. his beard and hair and chest hair began to become unruly.
His waist thinned, his bare toes ended in the same sharp white claws, his ears pointed, and his face pushed out and stretched into a muzzle, becoming a werewolf shape.
Jonathan was now 100% werewolf.