What would you think of an Enforcer of sorts who has made himself known as being "that guy you don't want to fuck with". 6'6(huge especially for the time), packed with muscles and scary as a mack truck. On top of that he's got business sense. And he'd of course be at Rascal's as a bouncer or maybe head of security? And due to his let's call it a "checkered past", Rascal's is one of the few places he can find legitimate work. And I know you said sky is the limit with terms to race as long as it makes sense so since he basically got to where he was by being big, strong, ruthless, and having a mind for business that his looks.
So if that character archetype is acceptable, could he be black?
Absolutely! That would work.
I think my character is going to be the primary head of security, but the Speakeasy could use some intimidating muscle. A few of the traits of Rascal's can actually help further this along.
1- Rascal's is an unsegregated establishment. The forefathers of Wayton worked with the underground railroad and have always had a vice against the government when it came to freedom inhibiting laws. (Slavery, anti-prostitution, prohibition etc). The only way to be let into the speakeasy from the 'Ton is by presenting a Golden token with the six pedaled lotus flower on it, on the back of all these tokens is written "Enter without Prejudice"
2- Rascals boasts a huge cave for its main room, but a back section has been sealed off by a heavy cast iron vault door and is simply known as "The Vault" only the most elite of individuals, personally known by Wayton, are ever granted access to this exclusive room. This would probably be the primary guard place of a large, muscled black man. From his position at the Vault he can see everything going on within the cave as well as assure only those who are allowed in the vault can access it.
3- With the lack of segregation many of the patrons come to Rascal's to seek out more exotic encounters with dark skinned women. Rascal's likely employs several of these and they probably are all under the watch and security of this behemoth guard.
How does that sound?