Role in current universe: rake and ne'er-do-well, neutral in the mob conflict.
Backstory/Description of new identity: card-dealer at the Midnight Rose, pool hustler at Ocean's place, omnipresent, seedy, and for sale, his only loyalties are to aces and eight-balls.
Significant changes in personality/mannerisms: Very little has changed, except that he thinks he belongs here, & may not recognize your character.
Kinds of CR/RP scenarios you're looking for with this plot: witty banter, con-man shenanigans, and general funtimes!