As someone who also pertains an interest to those of a scruffy nature, I am sorry to say, there simply are not a lot. The best you can get is neat hair but with a bit of a beard. And even less common are those without a large age gap.
Shoujo:
https://www.mangago.me/essay/create/?question_id=824817
Not exactly romance, but;
https://www.mangago.me......
