This is NOT a fantasy RP. Rather it is a HISTORICAL RP set in a time and place where people are still moved by superstition and the use of magic highly frowned upon - preferably between 1456 and 1776. (Yes, the title was inspired by a book by Christopher Stasheff.)

en.wikipedia.org/wiki/Renaissance_magic

Our young “warlock” will be a young man (around 20) from the 21st century. He was a prodigy in Physics and Chemistry. He has been thrown back in time thanks to a temporal accident. Bereft of the advantages of his time he will soon find himself struggling to adapt and make a life for himself. His knowledge can’t help but be considered arcane. His initial encounters will determine how he develops in the local time.

Local SpaceTime
I have left this open 1456 to 1776. I have also left the location open. I would prefer that English be the local language though - or at the very least not in a nation that is opposed to the English. (Scotland would still work, for example. France was on poor terms in most periods though.) You will need to know the local history. I will likely look up a list of technological discoveries around that time and create a list of what has and hasn’t been done as best I can.

Your Character
(We have a few options. But this is supposed to be a MxF.)
A native to the local time. If you choose this route, you might want to consider several extras, appropriate to your character.

A girl from Duncan’s time. (Duncan’s was working alone. But he might let a GF into his lab.)

A girl from a different time between 1776 and 2020. This option is a bit limited. Duncan had plans to aim for 1881, then 1921, then possibly the middle ages or WWII. He had foreseen WWIII and the end of civilization. This RP would be the result of a system error. Only problem with this idea is that by this point he would be bringing gear. His first jump was supposed to be into the future - after WWIII. In that one he does carry some gear and provisions - like a combat CBR suit, geiger counter, etc.