So, the Archanphel and Exceed figures you've seen pictures of, are from the original Bio Fighter Collection from around 2005-2010. They were proto-types shown of figures to come. It is unknown if the non posable Archanphel was going to be a separate release under the non posable Bio Fighter Wars line, or just a painted proto-type for the BFC figure that is shown unpainted. Unfortunately the line stopped at Imakarum
Here is a basic list of the officially released Guyver action figures, or figures that are supposed to be coming out, not including live action movie stuff, since they are clearly differently designed. I might miss something, but this is most of it.
Manga Release:
1/6 Scale non posable Guyver 1 that came with vol 21 of the manga.
Bio Fighter Collection: (Fully posable figures with changeable parts. Precursors to the creation of the entire Figma toy line)
Guyver 1, Guyver 2, Guyver 3, Aptom ver 4, Murakami, Guyver Gigantic, Gigantic Dark, Zx'tole, Neo Zx'tole, Guyot, Purg'stall, Imakarum
Bio Fighter Wars: (non posable but generally in the BFC scale)
Vamore, Panadyne, Gergoile, Zerebubuth, Zancrebe, Ramotith, Enzyme 2, Test type(Malmot), Gaster, Darzerb, Thancrus, Elegan, Evil Aptom, Barcas w/ bio tube (was a limited special release)
Figma:
Guyver 1, Guyver 2 Female, Guyver 2 Female (OAV ver), Guyver 3, Guyver 1 2.0 (coming soon)
Prime 1 Studios:
Guyver 1, Guyver 1 bust, Guyver 3, Guyver 3 bust, Guyver 0, Aptom Omega Blast, Guyver Gigantic, Gigantic Dark, Female Guyver 2 (only teased so far)
Max Factory Anniversary Figures: (not released yet, only proto-types shown)
Guyver 1, Guyver 3
There was also 2 sets of smaller "trading figures" released during the 2005 Tv shows airing alongside the BFC figures.
There have been various 3rd party/bootleg figures out there as well as people 3-d printing their own stuff now too.
K-Soul is company that still exists releasing unofficial Guyver stuff. They have done at least a statue of Guyver 3, some chibi figures, and smaller busts of a lot of the Guyvers. They just released the bust of Guyver Gigantic I believe.
Then there was Sanken, who managed to release 1/6th scale figures of the 2 Gigantic's, and teased 1/6th scale Guyver 1 and Murakami releases... but shut down soon after.
But finally, all the old Max Factory 1/12 and 1/6 scale Garage Kits from the late 80's and 90's. They are still around, but have had knock off recasts sold by numerous companies.
Yes, there it seems like there is a lot of Guyver stuff out there... But most of it is over 15 years old, some of it over 30 years!