Is there any character like that?

[oshfdk]

Everything points to sloppy. The continuum nablator points out. Our inability to match different forms to different contexts. Practice in other informal medieval mss...

All of these do point to sloppy. But not the fact that it's possible to produce sloppy Voynichese, as ErinaBee did. Overall the scribe of the Voynich MS seems to be very proficient with the quill. It's possible the scribe chose to be somewhat careless with the writing, but I think not for the lack of skill.