- Admiral Alexander Kolchack (commander in the East)
- General Peter Wrangel (commander in the South)
- General Anton Denikin
- General Peter Krasnov
Kolchak stated number of times that he's a temporary ruler, until "people of Russia express their will", and he was not overly ambitious, just kinda of patriotic technocrat. He did not have Ataturk gene. Although I can imagine him staying in power for a long time "to overcome dire situation". Vrangel nad Denikin are pretty much conflicting parties, it is pretty hard to imagine TL with them both in charge simultaneously. Krasnov had been pretty much German marionette (and had been recognized as such by all parties in Russian civil war), so chances of him becoming dictator after Civil War are slim without German victory in WWI. Yudenich was capable, but relatively minor figure (his leap for Petrograd was typical Civil War thingy, when determined commander of small force can do short-living wonders), although would he control Petrograd and Northwestern Russia, he could have pretty solid negotiation position post-war.
Most Russian analysts consider junta of Kolchak-Denikin or Kolchak-Denikin-Yudenich to be most likely outcome.