Incoming armchair critic post. This might ruin the fun of it for some of you, so feel free to skip.
There are... interesting ways of acting in accordance with either Jedi or Sith principles, which sometimes don't even appear to be in accordance with said principles unless further context or perspective is given. Violently ending a totalitarian regime via revolution, for example, is in line with the word of the Sith, while supplanting a legitimate government with a totalitarian regime is in line with the word of the Jedi, and the spirit of either is another matter entirely, with an even greater number of interpretations.
Whether or not Grey are even canonical depends on who you ask, but the category itself is mostly a bland umbrella for anyone not fully to one side or the other, serving to eliminate nuance when it does exist by reducing Jedi and Sith to puritanical interpretations of their creeds. Not to mention all of the crappy "Grey" OCs.
I mean, the protagonists of Gurren Lagann, for example, are basically Sith even if they're unquestionably good people because their passion, determination, and fighting spirit are what make their giant robots run, and they're out to murder evil gods with fuckhuge drills, while the Necrons from Warhammer 40K are tranquil, unemotional, value knowledge above almost everything else, and in spite of being model Jedi, aim to exterminate all other life in the galaxy with eldritch weaponry.
For the sake of examples which are relevant to LoL,
and
fit the Sith Code to a tee, while
and
couldn't be more in line with the word of the Jedi Code if they tried.
Neither Jedi nor Sith codes command one way or another when it comes to compassion, justice, whether or not an action is moral, what morality is, whether or not morality even matters, and a host of other things.
Now, Star Wars generally has this childishly binary view of "darkness/chaos = evil and light/order = good," but the minute you apply moral principles from outside the Star Wars universe, the entire Jedi-Sith dichotomy gets thrown into a grey area because one acknowledges that morality is not only more nuanced, but utterly independent of dark vs. light or chaos vs. order. The only reason the Jedi and Sith end up being so purely heroes and villains, respectively, is because it is deliberately written that way in spite of being absurdly unrealistic.
This is also why DnD alignment charts fail at character analysis forever. In particular there's a famous meme with all of the windows taken up by various panels of Batman doing alignment-appropriate actions, thus proving that a character can quite easily change "alignment" or even occupy multiple "alignments" at once, but I digress. The point is that whether one is a Jedi or a Sith would logically be independent of whether one is good or evil no matter which system of morals one would apply, and that the reason this is the case is that their creeds can be interpreted in myriad ways to rationalize or justify a wide range of actions.