l. In-Game Names:
There are other options, but again, players are encouraged to reach out to tournament staff for confirmation if they are unsure of whether a separator is acceptable or not.
No separator is required if the casing of the last letter of the tag does not match the casing of the first letter of the nickname.
Tags must always use the exact same characters (including the separator if applicable) as the official tag the team is registered with for every single character.
In Marvins case he used a small n / symbol wich isn't the same as the first letter of Chan wich is in capital.