I think that the Soviet Union would still be a nasty dictatorship but would not murder on the industrial scale of otl
No Hitler I think means no Nazi rise to power, probably some more conventional reactionary government in Germany, maybe a Monarchy
I do not think no Tojo makes much difference, crazy aggressive (and in my view evil) Militarists would have a lot of sway
In a context of no Hitler no Churchill makes little difference to the UK except that there might be less resistence to Indian independence
Italy is probably chaotic- I do not know enough to say anything more
I am wondering who the Democrats would run for President? I ask American experts to comment on this
I believe the industrial-scale murder is more properly applied to the Nazis... the Soviets were all about just deporting troublesome people or groups to Siberia or Central Asia, more of a mass "we're putting you here so you don't collaborate with the people invading us" than mass murder. Except for Katyn, except for Katyn.
No Nazis could put a lot of different people in power, conservative right-wing dictatorship, communists, hell maybe even a surviving Weimar Republic (however unlikely), Germany will probably be a basket case but not a horrible basket case.
Japanese leadership is clique-based, it doesn't coalesce around one singular person like Hitler and the Nazis, I agree with you.
Yeah at that point we'll have changed things so much it's uncertain how Britain will be affected, colonials will in general have an easier time of it, without ol' Papa Churchill around to gas them if they rebel.
Italy... hell they were screwed up in the Depression, probably someone extremist, hopefully more efficient than Benny.
Dems have a lot of choices, Al Smith and John Nance Garner who both ran in 1932 OTL but lost to FDR are possible. Plenty of people can take up the mantle, I think Smith and Garner who were never keen on the New Deal or things like it wouldn't be as good at resolving the issue as FDR was though.