What Comes Next ?

[hisgrace]

have fun with what comes next:-
XII,X,XV,XI,XII,XXIII,?
F,G,J,P,Q,?
T,Q,P,H,H,O,N,?
E,T,A,O,I,N,?
Wilmington,Bute,Chatham,Shelburne,Liverpool?

[kettledrum]

Earl Grey - Earls who were Prime Minister

[dundurn]

E,T, A,O,I,N,S,H,R,D,L,U order of letters on a linotype machine

[dundurn]

f,g,j,p,q,y - lower case descenders in handwritten form

[dundurn]

I think you may have a typo - the first looks like the regnal numbers of Popes, in which case the first one should be XIII?

(Leo) XIII, (Pius) X, (Benedict) XV, (Pius) XI, (Pius) XII, (John) XXIII and then (Paul) VI, (John Paul) I, (John Paul) II, (Benedict) XVI

[irisTHFC]

T,Q,P,H,H,O,N is Triangle, Quadrilateral, Pentagon, Hexagon, Heptagon, Octagon, Nonagon