Alchemy: Vibe Quick Acting Hair Tonics
Oh man, I bet there's some pissed off MHA fans out there because they didn't make a red and white one. They made every other color but Todoroki's, I feel like they knew what people were gonna want to use it for and just went "Nope!"
To become a zombie you have to participate in the February Survival event. If you have participated in the past, go into your wardrobe and click the "skin" tab, then click Filters, Show, then click "Earned." Choose a zombie skin (for reference, Zombie list Post), click "Wear" then go to the alchove.