IZ Jekyll and Hyde

Intro okay, so, if u don't know who Jekyll and Hyde is... search it up, google exists. so, in this au it's around 1800s. Dib is the son of Dr. Membrane, a very well respected figure in his community, but is supposedly insane because he was a huge troublemaker when he was younger and would claim to see monsters in the woods (even though he fully believes he did). so, in an attempt to fix this he decided to look through his fathers lab and messed around a bit, accidentally making a potion that split his personality into his "good" personality (Dib) and his "bad" personality (Zim). Zim is a chaotic alien that Dib transforms into when he takes the potion, but when he drinks it again he turns back into Dib. Dib used this to have an alter ego that he coupd be a bit more crazy with and try to prove his claims, but eventually Zim developed his own consciousness, and started to rebel against Dib, causing more trouble when he's in control of Dib's body. Dib, becoming worried, stops taking the potion, and stays Dib for about a month. the joy of realeasing his urges overtakes him and he takes the potion one final time... then Zim murders someone who said aliens are fake. Dib takes the last of the potion, hoping to get rid of Zim forever, but Dib will sometimes black out and wake up in alleyways, wakes up in Zim's form and changes back when he rubs his eyes, and can hear Zim talking to him in his mind. he knows Zim is still there, but without the chemical he can't control it. currently, it's a summer evening and Dib is reading in the library, when he can feel a black out coming, and he fights it. he stops it from happening, but he knows Zim's there. (Ur Zim BTW)