Linear like a freight train, Lili is an extremely polarized character. In exchange for being very vulnerable to sidestep, she's a pressure powerhouse with stellar punishment who has the best sidestep in the game.
Able to cut her opponent off with strings, slip around their offense with ease and blow them up with her infamously evasive Matterhorn launcher, she can then set them up and knock them down with her damaging backturn stance 50/50 once they freeze up.
Aside from her linearity, her main weaknesses are her flawed DF1 and lack of fast counterhit tools. These combine to make picking your moments important. Additionally, Lili has a fairly deep movelist with many options. This can be a weakness or a strength.