The J-Series are elite British Intelligence agents who are the namesakes of Sir James, who built himself as a legendary spy and propagate his image in these agents. There are at least six J-agents, who are referred as J1 to J6.
There is also a reserve J-Series, who are non-standard reserve agents consisted of predominately ethnically white women and elderly men, and are mistreated as inferior (or expendable in the case of J-R4) by the regular J-Series.
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The J-Series are based on the various James Bond actors Sean Connery (J1), George Lazenby (J2), Roger Moore (J3), Timothy Dalton (J4), Pierce Brosnan (J5) and Daniel Craig (J6).