I don't think I have anything positive to say about Li Mei so I just won't say anything at all.
X-RAY: 1st it's a low blow kick. Next, it's her carnival kick (sending the opponent up the air). Then, her flying fists with a powerful punching blow at the end.
Oh I have another X-Ray idea!
First, she does her "brutality" where she punches the opponent in the pressure point areas (like her fatality in MKD) as X-Ray of the damages being done are shown. Then, she should do a powerful uppercut, breaking the enemy's jaw in the X-Ray image. From there, she could follow up with a combo. ;-)
Not sure, but I'm sorta brain storming Alisa's idea in here. I got it.
Li Mei's X-Ray:
She starts off with a Carnival Kick that sends the opponent right above her before she kicks them higher up in the chest, breaking the ribcage. Then she jumps high in the air, and starts a flurry of punches all over the body, rupturing and breaking every chest bone and skull, before finishing by landing on the floor first and delivering a powerful jackknife kick to their back, breaking the spine as they get sent back to the ground.