Sareena, who is most likely the best example of this next to Quan Chi. Despite debuting in an unpopular spin-off, there was quite a bit of fan interest to see her return for future games. After several attempts to make it into the series proper, she's finally made playable in Armageddon, where she proves to be a valuableally of Younger Sub-Zero and is made into a top-tier character.
Harsher in Hindsight: After Bi Han returns with Shinnok's Amulet, he asks Raiden about what Quan Chi meant by him being tainted with evil what that meant for his future. The thunder god told him that "But only you can control your destiny. Not even the gods can alter your chosen path in life." These words would likely haunt Raiden in light of what happened in Mortal Kombat 9 in which he sent a message to himself into the past to alter the timeline in order to thwart Shao Kahn's victory in the Battle of Armageddon and ended up unwittingly bringing about several heroes' death in the process.
Shinnok's epically smug trollface seen after he kills Sareena is also catching on.
Narm: The FMVs... are kind of laughable, one example being the cutscenes that play whenever Sub-Zero falls down a bottomless pit. They are quite overdramatic and look very cheap, even using the exact same animation.