I populated Bioshock 1, so that can be removed from the list.
By my reckoning, and should my above requests go through, that leaves the following individual games/anime in a series without posts:
castlevania_the_arcade -> castlevania
dead_space_1 -> dead_space
gundam_seed_c.e._73_stargazer -> gundam_seed
heroes_of_mana -> seiken_densetsu
langrisser_i -> langrisser
negima!? -> mahou_sensei_negima!
onimusha_3:_demon_siege -> onimusha
rance_i -> rance_(series)
rance_iii -> rance_(series)
rance_iv -> rance_(series)
valkyrie_profile_1 -> valkyrie_profile
zokuowarimonogatari -> monogatari_(series)
As discussed, all catch-all wiki pages now link to the individual games/anime. I'm not very familiar with any of these series, so if anyone with knowledge wants to see if any of the posts under the catch-all would fit one of the individual entries, that would be hugely appreciated. Otherwise, we can probably leave them be.
One other case is yakin_jantou and yakin_byoutou. I haven't been able to find a good list of all games in the series anywhere, and our wiki on yakin_byoutou is quite confusing. I have no idea why it's laid out by staff rather than by game. If anyone is familiar with the series and could clear it up, that would be a huge help.