For Windows TrueType fonts, the settings can be made by [WinJFont]. If the size or the horizontal and vertical positions are not adjusted in major changes, the balance with other characters may worsen. These settings can be made by [WinJFont], but there is no automatic adjustment of the vertical-to-horizontal ratio of the characters matching jfm/tfm.
When a built-in LBP Japanese font is used in Printing, the length and flatness can be specified by the -dviprt: parameters. The length and flatness matching jfm can be automatically adjusted.
In the package exjfont.zip, there exist jfm files of flat and long mincho fonts and the parameter file to set [WinJFont].
Using graphics package of LaTeX2e, one can deform characters by the command \scalebox.