Dr.Mario 64 has even more references beyond the characters that were already mentioned.
Puffy Wario makes an appearence in two of the story mode cutscenes:
Vampir Wario's losing animation has him turn into his bat form:
Para Goom may not be...
Here are two VERY interesting bits from Mario Party 8:
Using the Vampir candy on a character will turn him/her/it into one.
Hm, Wario as a Vampire:
Using the Springo candy will turn the characters into living springs:
Wario even looks...
I have disected Warios moves and mannerisms in Smash, to find a possible origin for each of them.
I won't mention the Shoulder Charge, Bike or Wario Man, because those are as obvious as you can get.
The chomp was likely inspired by "Hot Dog Hog"...
Superstar Saga's Wario poster is based of the japanese mega microgame$ cover:
Bobo already mentioned the Bull Wario cameo on Wario's Shipyard, but here is a pic for those who havent seen it yet:
Not sure if this would count as a reference since it's technically from the same series but... whatever, I like it. ^^
Game & Wario redid some backgrounds from previous games like Dr. Crygor's lab here.
You can also see similarities in Wario's...
The Bucket fron Mario & Wario has gotten a couple of references.
Once as a Trophy in Meele:
Another time in Mario & Luigi Bowser's inside story, when Junker ( a boss in the game ) drops it on one of the brothers, causing them to wander around...
First of: here are the promised ,improved Sports Mix pics of Warios charge and pound:
Let's also take a look at Mario Kart 64's Sherbet Land :
It's an icey island with penguins wandering around.
The Wario Land level of the same name has a...
Three cool references from Mario Sports Mix:
Warios special move in all sports, is the Wario Ware bomb
(which is yellow, for some reason) :
The second part of Warios tackle combo in ice hockey, has him do a shoulder charge like air tackle...
I found three little references in the arcade Diamond City race track, the pics aren't very good unfortunately, since I had to rely on videos...
There is a castle that looks similar to the one in Ware:
A path that mimics Warios house, from the...
I'l put all of the posted references from other threads here, so that they are all in one thread.
Warios sleeping animation in Brawl, looks a lot like the one from Lands 2 & 3:
First posted by: Bobo
The Shoulder Charge is in Mario Golf...
The intro of Mario Party 2 has two nice little moments:
Wario want's to rename Mario Land into Wario Land:
Which is funny because Wario pretty much replaced the Mario Land series around that time.
Wario rams head first into the others, similar...
The Wario car isn't just in Mario Kart Double Dash!! :
It's also in the second Arcade Mario Kart:
The "Brute" from Mario Kart DS is also heavily based of it:
( Gotta love that recycled Wario btw)
I was just playing classic mode, to grind for custom moves, when suddennly (in Pictochat 2) this popped up:
It's the noses with legs from Warioware Touched's title screen:
The back of Warios jacket in Brawl and Smash 4 reads"Hurry up!!''...