This mod makes Mari and Basil playable, through use of the OMORI Console mod, found here. https://mods.one/mod/console

Basil is as accurate to his playable appearance in the console version of OMORI as I could make him with my knowledge of RPG Maker, and Mari has a fully unique moveset and equipment.

To use Mari and Basil:

type /removeparty into the console and then remove whoever you want to replace with the new characters.

/removeparty 1: Removes Omori

/removeparty 2: Removes Aubrey

/removeparty 3: Removes Kel

/removeparty 4: Removes Hero

Then, once you're done with that, type one of the following commands to place the new character in the appropriate slot on the battle screen.

/addparty 18: Places Mari in Aubrey's slot

/addparty 19: Places Mari in Hero's slot

/addparty 20: Places Mari in Omori's slot

/addparty 21: Places Mari in Kel's slot

/addparty 22: Places Basil in Aubrey's slot

/addparty 23: Places Basil in Hero's slot

/addparty 24: Places Basil in Omori's slot

/addparty 25: Places Basil in Kel's slot

In the future, I'll try to update this mod with a way to add the new party members to the group without needing the console, but I need to do a bit more research into how RPG Maker works before I can make that happen.

Special thanks to the "Leaks, Sealed!" mod which I used to help build this mod before moving it to its own standalone build, and to @Tor_azi on Twitter for some of the assets used for Mari.