Outlaw and Scholar tags should be available in character creation for custom characters.
The tampering or corruption error means that at some point the checksum value when loading a save did not match the value created when the save was made. Since you did actually change the data, that means the checksum value (calculated across all of the save data) will change. Once this check fails a flag is set in the save, so any saves made after that point will always give this warning.