I love that we're finally getting some real customization for Him and I can't wait to see how it turns out.
As others have said, this completely breaks MC at the moment. However, I didn't get the timeout error that was mentioned. If you load this before MC, it will return a simple 'Mod Loading Failed'. If you load it after, it breaks all the mod types in MC and you will get an error for every item loaded in your MC, saying that the allocated type is unused.
Additionally, I noted that it breaks character folders. You can still open custom character folders and it will accurately display the saved options with the proper thumbs, but you can't load them. This is not to say loading will fail, but that literally nothing happens. If you click one, the menu just stays open and nothing happens, as if you didn't click anything at all. I thought this might be because all my custom characters use MC, so I made a custom coded version of SD Chan with no alterations and got the same result. This also applies to any mods listed in this menu, in addition to char codes.