UK: Cameron (the 'heir to Blair' who raised immigration despite promising to lower it, succeeded in achieving nothing conservative [the few ideas they had, like the proposal to crack down on internet pr0n, failed] and succeeded in everything liberal, e.g. same-sex marriage). Blair was obviously worse overall, but at least he didn't purport to be Right-wing.

Germany: Merkel. Played a bigger part in ruining Germany's demographics than any other Chancellor with the millions of 'refugees'. However, in a few years, the horrid SPD-Gruen-FDP Scholz government will likely have turned out to be even worse in retrospect.

France: Mitterand. But at least Mitterand didn't pretend to be conservative. Sarkozy, of Hungarian-Jewish extraction, did, and turned out horrible in retrospect. See, for example, Faye's Sex and Deviance:

Nicolas Sarkozy forced his Prime Minister to employ young women of North African and Black African origin on the basis of entirely feminist and multiracialist motives.

Hilariously, the bastard tried to reinvent himself as a French nationalist for the Les Republicains primary, hoping to make a comeback by trying to attack most or all of the opposition from further rightward. He failed in this endeavour, with Fillon winning the primary. And, of course, there are his utterly detestable claims that France would somehow die without miscegenation and that French people needed to be pressured to miscegenate. The utter blithering drivel from this mischling's mouth!

Macron might end up even worse in the long run than Mitterand/Sarkozy if he continues in office.

I'd also add Leo Varadkar, the homosexual half-Indian from Ireland's 'Right-wing' who typically doesn't seem to do anything 'Right-wing' whatsoever. He can of course be found attacking Catholicism, etc.

Ukraine, I mean, Jewkraine: Zelensky. How a literal Jewish comedian was elected head of state is anyone's guess. Poroshenko wasn't much better (pro-EU, had a Jewish Prime Minister).