Professor didn't want to list a lot of Wizers, but I kinda do, so here it is, if you're interested!

• Wizer Kast, is me! The one who lives in the same world with you :D

• Wizer Klassic or Wizer Kyborg (original, kinda) lives in Varytale 

• Wizer Kold lives in Varyfell

• Wizer Klaque lives in Varyswap and Susswap!

• Wizer Krazyman lives in Horrorvary, and is somewhat trapped there

• Wizer Killer lives in... killervary, I think-

• Wizer Kaptain lives in... Oceanvary? Never wondered what the name is, I should ask him...

• Wizer King (a.k.a. Narcissus) lives in Varypride

• Wizer Kross did not appear yet (thankfully . _."), but he's like X-Sans, so he will not have a universe

• Reaper Wizer doesn't live in his Undertale world, he lives in Aren't Grim Reapers Supposed to be Scary? world, but his Undertale one should be Reapertale, I suppose (which is a weird name considering only two monsters are reapers and a lot of them are gods, why not Pantheontale or somethging like that?...)