True Oblique

Hello Friends.

I have a question that is very important for me to solve, but this is me this complicated, because you do not find a specific answer.

Does anyone know where I can find information for the construction of letters TRUE OBLIQUE? (starting from the REGULAR STYLE)

At this time I find myself talking about a ROMAN FONT,

only the basic characters mainly from lowercase, but it would also be good to understand the Uppercase.

Can anyone help me please? I infinitely appreciate.

Thanks in advance.