Considering there are many threads discussing succession in a victorious Third Reich, I'd ask a different question for a change: In a scenario where Fascist Italy survives WW2, who would succeed Benito Mussolini as leader of Fascist Italy and why?
Scenario A: Fascist Italy survives by virtue of staying neutral ala Spain in WW2
Scenario B: Fascist Italy survives by virtue of the Axis "winning" WW2.
Scenario C: Fascist Italy survives by virtue of WW2 being averted