This is the template for any character I simply do not have a sona for.
They are almost always gray to some degree, unless I specifically NEED them to be a certain skin color to get a point across. Most are androgynous, though I have been known to add some boobs to emphasize the fact that I was with a female, or even write text across them to label them when it is a specific friend that I haven't made a character for.

One regular character was also turned into this when I retired their 'sona due to many years of hardship and grief making it actually necessary to stop using it. But I still hang out with them from time to time so the filler character takes their place.

If you are reading this, sorry. I know you said its ok to keep using the old character but after everything that has happened it just doesn't feel right. It's not you anymore. Whoever that character was doesn't really exist anymore. You've moved on and so must I.