Obviously Waft is good but you don't always have that. Side smash is decent, back air is good and up air and f-throw can kill at the edge but I find it hard to ko. People get to 200% sometimes and it's frustrating as a wario main to get a kill.[/quote
Surprisingly Wario has some pretty safe kill moves despite his slow side smash and predictable up smash. His forward tilt is a quicker version of his forward smash that kills easily at percents higher than 130%. With enough rage, his forward throw kills as early as 110%. Something to remember with waft is that half charge also kills decently early, and either charge of waft should only be used when your opponent leaves him/herself vulnerable or when they are trying to recover. Down air is lethal at high percents, especially off stage. As for other options, landing an up smash, up air, or back air is all about making a good read on rolls or air dodges. Also back air can be a gimping tool. Hope this helps