Update on speculation etc:
Toad Road - Lakitu (confirmed), Wiggler (confirmed)
Boo's Horror Castle - Dry Bones (confirmed), King Boo (speculative)
Bob-omb Factory - Whomp (confirmed), Big Bob-omb (confirmed)
Blooper Beach - Cheep Cheep (confirmed), Blooper (confirmed)
Magma Mine - either Monty Mole or Bully (speculative), Chomp (confirmed)
Bowser Station - Bowser Jr. (speculative), Bowser (speculative)
DK's Jungle Ruins - Diddy Kong (speculative), Donkey Kong (speculative)
@Jimmy - congrats on sounding overbearing. You'll really earn some followers wontcha?
Toad Road - Lakitu (confirmed), Wiggler (confirmed)
Boo's Horror Castle - Dry Bones (confirmed), King Boo (speculative)
Bob-omb Factory - Whomp (confirmed), Big Bob-omb (confirmed)
Blooper Beach - Cheep Cheep (confirmed), Blooper (confirmed)
Magma Mine - either Monty Mole or Bully (speculative), Chomp (confirmed)
Bowser Station - Bowser Jr. (speculative), Bowser (speculative)
DK's Jungle Ruins - Diddy Kong (speculative), Donkey Kong (speculative)
@Jimmy - congrats on sounding overbearing. You'll really earn some followers wontcha?