Trying to come up with a Spring Hills Jack Charecter to be a Boss fight

I am building a campaign and one of the side quests/random encounters is with a serial killer based on Spring-Heeled Jack. 

Short version, he was a fixture in Victorian era London. Often attacked women, said to have metallic claws, breath green fire, and his name sake was the fact he could leap over tall gates and fences. Often attaqcked people of wealth, but right now I have him attacking the slums as 

Presently I am thinking Monk with Vampire vibes. and perhaps and a 4D6 flaming breath attack that recharges on a 6. And the monk would be a couple Bonus actions to use flury of Blows. or not, and just do the other. 

I was wondering what your thoughts on it were