I don't want to make an image of an Aradia without any blood on her hands, but as far as intent and actual harm brought Vriska is clearly ahead.
When Aradia manipulated her friends it was done at the command of another power. Granted she does hold the responsibility of the act, but it wasn't her idea to do such things. Vriska is always trying to manipulate her friends in chats, always looking for a way to dominate them of her own accord. Aradia started a chain of events that may or may not have caused Sollux to die, as the presence of a prototyped sprite means he awoke before the glub and had time to do whatever he needed to enter the medium. One could argue her action was simply to get him to be the last one in, not to die from the glub. Compare this to the direct plotting and influence of Vriskas friends to kill Aradia and deceiving Terezi.
Aradia is indeed no angel for what she did. But Vriska is still queen bitch of this universe.
Oh, but Vriska NEEDED to kill those trolls to feed Spidermom. And Eridan REALLY NEEDED to kill their lususes to feed Gl'bgolyb, and the trolls probably would have objected. If you really felt like it, you could even interpret it as helping Eridan stop the armageddon, and putting the enemy casualties to some use.
As to the Harm Leaderboard, Vriska's killed maybe hundreds of trolls? Thousands? I don't know how often giant spiders eat. Anyway, Aradia tricked her friend into translating a bunch of ancient hieroglyphs into a computer program, implying it would save the world they knew to be doomed, while in reality it was the cause of the predicted apocalypse. Aradia's machinations destroyed the entire Troll civilization. She knew that playing Sgrub would torch the planet with meteors, and still obeyed the voices in her head and got Sollux to make the game. To kill even a billion trolls, Vriska would have to feed a hundred trolls a day to her mom, every day, for about 27 000 of our puny human Earth years. And considering the troll civilization has spread to the stars, the total population could be in the hundreds of billions. Trillions. Who knows. Anyway, I'd say apocalypseArisen wins here.
Of course, Vriska's crimes are easier to approach. She's just a serial killer. But destroying a civilization? It's much harder to emotionally relate to that. There are just no real-world parallels. And Vriska seems to really enjoy her chosen profession of mass murder, whereas Aradia just goes along with it like the emotionless ghost she is.
But I like them both. Let's not bicker about
who killed
who, we're supposed to be shipping people here! Eridan♣Gamzee♣Feferi!
The new Bluh didn't make me laugh this time.
I think Hussie is using them up entirely too fast.
It was an ironic Bluh. He is mocking himself for overdoing the Bluhs, using yet another Bluh panel, while in reality he really likes them and would take any worthless excuse to add more of them. There are so many nested layers of irony here.
All the layers.
All of them.