Eden Zero's trial that was posted here could probably be posted on F95zone along with the MTL / fixes. Now I just need to find out how to get "Remil and Leona" into the party - need them to go through a door apparently, maybe they were bosses... Can't remember characters with those names though. Will search again.
Edit: They are at the starting area - no option to add them to the party.
Intro of Eden Zero allows you to decide which of the three starter characters you can have. This being between "Selene", "Himari", and the one you are missing "Remil and Leona". If you skip the intro you are forced to have Himari as your starting party member. Under normal circumstances you are only allowed to choose one starting character as a party member.
All that said, you can modify your save to attain all starter party members.
Such as downloading and using the RPG Maker Editor tool on this site:
https://f95zone.to/threads/rpg-maker-save-editors.51/
The way to do it would be to make a save with everyone removed from your party, then use the MvSaveFile.exe that comes from the link above and go to the file EdenZero is in and select the save you made located within www/save, after selecting your save it will open a .json file of the save, in this file do a CTRL-F search for the following: "_waitingMembers"
Once there you would add the actorID of the missing character within the brackets [] following it.
"Selene" being actorID 2, "Himari" being actorID 5, and "Remil and Leona" being actorID 6.
You could also add the intro characters that you normally cannot add to your group, that being the silent knight "Marusun" and the person who always revives you at the starting house "Sherry".
Marusun being actorID 33 and Sherry being actorID 32.
A finished edit of every possible companion being added, including those you would normally be able to recruit as you play, would look something like this:
"_waitingMembers":{"@c":88,"@a":[6,2,5,4,22,21,3,33,32]}
If you don't want to do all that, you'll either have to start a new game, use a save file that's been posted here, or just PM me the save and I'll mod it for you when I have time.