Sektor and Smoke. I said Sektor's is debatable because we don't know if he killed his father to become Grandmaster. Smoke's I'm wrong on, I think; I thought we already knew he was an enenra before MK9, but I just checked the wiki and it seems not. If that's the case, then Smoke's is likely canon.
Generally speaking, backstory information revealed in an ending is canon, regardless of whether or not the ending itself as it happened is canon. Examples include...
Scorpion (MK1; murdered by Sub-Zero and resurrected)
Sub-Zero (MK2; younger brother of MK1 Sub-Zero; also mentioned in Scorpion's ending)
Scorpion (MK2; killed the original Sub-Zero in MK1)
Kitana (MK2; parents were overthrown and killed by Shao Kahn)
Mileena (MK2; clone of Kitana created by Shang Tsung; also mentioned in Kitana's ending)
Sindel (MK3; mother of Kitana, true husband ruled Edenia but was killed by Shao Kahn; also mentioned in Kitana's ending)
Kabal (MK3; former member of the Black Dragon)
Tanya (MK4; while her bio suggests that her letting Quan Chi and Shinnok into Edenia was an accident, her actions in her ending clearly prove that this was no accident and she had betrayed her realm all along)
Quan Chi (MK4; gave Shinnok a counterfeit amulet and kept the original)
Scorpion (MK4; Sub-Zero was framed for the deaths of Scorpion's family and clan all along, the real killer being Quan Chi; was also mentioned in Mythologies, which was developed at the same time)
Noob Saibot (MKD; identity revealed as the original Sub-Zero from MK1)
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