I have tried again today to solve your issue based on what i know so far, but the mods work fine on my end.
What i've done was downloading all the mods you've downloaded on itch.io to ensure the same setup and mod versions, there doesn't seem to be anything wrong there
(TIP: Personally i copied the mod filenames from mods folder to ensure that there's no spelling mistakes).
Next was the "Always win coin tosses", no issues here even when i replicated the exact setup mentioned on the page.
The only thing that didn't work for me was having the "Alternate Marcoh Walk". possibly because in my case all my files are decrypted and not encrypted, which prevents me from playing as Marcoh as i get a "Loading" screen on my end that won't go away unless i replace the files with the old files.
There are not many things that i can suggested or ask from you, but let's try and see if we can possibly get somewhere.
1. The "Always Win Coin Tosses" mod has you editing the "plugins.js" and putting the mod in "js/plugins".
There could be something wrong in how you modified the "plugins.js" file or the mod could be missing from "js/plugins"?
2. Regarding the "Alternate Marcoh Walk" i'm assuming none of your files are ".png", at least not in "img/characters", but then again you wouldn't be able to play if encountered this issue.
3. Have you ever used any other mods that had you edit the game, other than the 2 mentioned ones?
4. Have you tried loading the "Always Win Coin Tosses" mod with my mod loader, does it still work(kinda hard to tell since coin flips are random).
5. I personally test my mods on a new save file, not sure why this would be a problem, but you could give it a try...?
6. I could give you my TY_ModLoader and index.html in case that somehow works via discord, add me as tobyyasha
7. Probably the last thing i wanted to suggested, you can try reinstalling the game to ensure a clean setup.
(The choice is yours whether you want to purse this choice or not, make sure to keep a backup of your save files, this includes the config.rpgsave and anything else that's in the "save" folder).