Technically Dr. Wario existed before Dr. Mario World, but the design used here is specifically that version. Similarly with Baby Wario, existed prior but the design here is from Dr. Mario World
Based off of Wario Land II official artworkBull WarioWario Land: Super Mario Land 3WarioWare, Inc.: Mega Microgame$!Mario Golf: Super RushTiny WarioSuper Mario Land 2: 6 Golden CoinsMario Tennis AcesWarioWare: D.I.Y.WarioWare: Snapped!Captain WarioGame & WarioCaptain WarioWario: Master of DisguiseWario DeluxeWarioWare GoldSparky WarioWario: Master of DisguiseCosmic WarioWario: Master of DisguiseThief Wario (aka Purple Wind)Wario: Master of DisguiseWario-ManWarioWare: Twisted!Wario BugWarioWare: Get It Together!Mario's Castle (Stolen)Super Mario Land 2: 6 Golden Coins
Dragon WarioWario: Master of DisguiseWicked WarioWario: Master of Disguise
Vampire WarioWario Land 3Genius WarioWario: Master of DisguiseArty WarioWario: Master of DisguiseDr. WarioDr. Mario WorldWario (Hiker)Mario Kart TourWario (Cowboy)Mario Kart TourFlat WarioWario Land IIJet WarioWario Land: Super Mario Land 3Dragon WarioWario Land: Super Mario Land 3King Dragon WarioVirtual Boy Wario LandDr. Baby WarioDr. Mario World