I've spent the last months working on creating a repository with images of characters to be used in machine learning programs. They are actual images, in .png format, and there are images for all characters of the English alphabet, both lowercase and uppercase. This is the only one of its kind on the internet and I made it manually. Here is the link to download it:
https://themindofmurilomiranda.blogspot.com/2020/01/a-repository-with-many-images-of.html