>>538834557
>>538834749
The "Core Four" is the same group marketable in the Classic and Modern (̶a̶n̶d̶ ̶B̶o̶o̶m̶ ̶r̶i̶p̶)̶ parts of the franchise. Shadow is the closest thing to the fifth member, but he's a Modern character with no official Classic design, so his use case is hampered. The fifth member will invariably be a rotating slot. In retrospect, this could have been resolved by making Classic an AU instead of Modern's past, but eh.