No, she forcely become one of the "good guys", because again, of bad writing. She didn't start as a good guy at all.
She joined the gatewatch exclusively because it was convenient for her personal agenda of getting rid of the demons, she never gave a ***** about the multiverse fate at all. (You can see in her Oath of Liliana card how much she cares about that)
She never been inherently evil, but she absolutely was the quintessence of selfishness incarnate. She wouldn't give a **** of everything and anything after becoming a Planeswalker (which was having the power and immortality of an oldwalker at that time)
The family who got killed in the trailer looked like her and her brother when they were younger and made her decide that living wasn't worth the damage she was causing.
I will never believe that a woman that literally made a deal with the Devil (Bolas and 4 demons exactly) to be immortal, because has a freaking terror and complex of death, would just throw away what she fought for her entire life...which is, exactly her life in this case.
The real Liliana I always knew would had wait to find a way to escape without exposing herself this way.
She acted based on emotional and morale impulse sacrifing herself like any random monowhite character
Maybe the only one person she really cared in the whole life except herself is her brother, true. I could see Liliana risking or even sacrificing her life for him, if that could reverse tha spell that corrupted him.
But Liliana completely losing her marbles just because of a random family that bites it because is in the middle of the casualty of a war? Are we really talking of the same Liliana that saw thousands of death and never gave a ***** of anybody? No, dude, this is all bull-***** to me.
A character making decisions you wouldn't have expected them to make at an earlier point is exactly what indicates character development. I will admit, it is often difficult to see, since the story is mostly a marketing tool, but it's there. We can infer from the last part of her Origins story that no matter which atrocities she committed she always found solace in the fact htat she wasn't the most evil being out there.
Quote from from=LILIANA"S ORIGIN: THE FOURTH PACT »
What was left that separated her from the wickedest villains in the Multiverse?
Just this moment, she thought, this one instant of hesitation.
That was always her excuse and working for Bolas has finally forced her to confront the fact that this is no longer true. Therefore, it makes sense, for me at least, that she would act the way she has in the story.
A character making decisions you wouldn't have expected them to make at an earlier point is exactly what indicates character development. I will admit, it is often difficult to see, since the story is mostly a marketing tool, but it's there. We can infer from the last part of her Origins story that no matter which atrocities she committed she always found solace in the fact htat she wasn't the most evil being out there.
That was always her excuse and working for Bolas has finally forced her to confront the fact that this is no longer true. Therefore, it makes sense, for me at least, that she would act the way she has in the story.