Hi !
A free model I down-loaded at DA looked like MMD/Anime, but was VRM.
I've never ventured into Second Life or used chat avatars, so I began researching the format.
To my surprise, I learned that VRM files are open format, free to use and have a free figure creator / editor at https://vroid.pixiv.help/hc/en-us
Vroid promise 'other' export formats but, as yet, only support VRM and 3D print.
However, VRM is a GLB file in disguise. Just change the file-type. As GLB, may be opened by eg Windows_10 free '3D Builder', Windows_10 free 'Paint 3D' or free Noesis, exported in sundry formats.
Which is where the fun begins, of course, of course...
OBJ is almost too easy, '3D Builder' even lets you dissect models, save parts as 3MF for later or export as OBJ+MTL+PNGs. Latter may suit 'dynamic' clothing, something I've yet to try.
If you want to keep the 'rigging', the FBX route via Noesis has usual issues: Either Poser_11 splats it, or breaks it to 10~~20 sub-rigs that refuse to play nice. And, yes, must be tediously deleted via 'Hierarchy'...
Scaling is an issue. I found ~16000 (16k) % seems to work for Poser_11, YMMV.
Poser also had problems with the FBX textures. I'm not sure what's going wrong...
Oh, and after I'd imported and deleted several VRM-derived FBX models, Poser suddenly crashed, shut down...
Still, a fun afternoon.