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@ShyGuyXXL, this is also a response to your post too)
Fixed the first point, I'm not sure how I got that mixed up...I even included a list of Wario games in the first page!
Like I said in the post, Wario's toilet humor was heavily stressed in Wario Land 4's promotional material, and his characterization in general. Even from the start, he was made to be a cross-eyed, intimation of Mario. The villain/ bad guy role was really up-played by American promotional materials, whereas in Japan it's been much more lighthearted.
Furthermore, the main "hook" of the Wario Land series (or at least as I see it), hasn't been used since Wario Land 4. The various "reactions" could have been made into a very interesting moveset, but were completely absent from Wario World and Shake It. The main thing that differentiated Wario Land and Mario Land were these reactions, and it's a shame that they don't have a platformer that uses this set up. It's a bit similar to Mario's hat system, but it's different enough that they really add a unique element to platforming.
Sakurai doesn't always base moves off the game, or moves that the character can do themselves. Sometimes, he takes from all kinds of sources, or tries to capture the
feel of the character (See Captain Falcon or Fox/Falco/Wolf). This is because in Sakurai's mind, the characters are
performing in Smash Bros. They are not the actual characters. Instead, they are trophy versions of the actual character. This is why some characters, despite having a perfect move-set available to them (Like Sonic, Snake or Luigi) have completely unique abilities or moves in Smash. Lastly, Sakurai wants every character to have something unique about them. Unfortunately, since Wario had elements of being viewed as a comedic, "idiot" character (See the WarioWare interview, Wario Land 4 promotion, Wario Land Japanese commercials) he was assigned that role to in Smash Bros. Again, since he's
performing, Wario was made to become an even more exaggerated version of himself. It's not like Sakurai pulled this moveset out of his butt (pun intended). Remember, all movesets are given the okay by their original characters. Therefore, Hiroji Kiyotake has approved of Sakurai's interpretation of the character. There had to be a reason, and I think my post illustrates why it was given the okay.
Personally, I'm not a fan of it myself (to some degree), but I can understand why he's designed like that now. I dislike the severe differences that exist in the translations in Smash for 3DS/ Wii U, as I feel they are really throwing Wario under the bus. In the Japanese version, they are much kinder and respectful to him. Especially the American version....wtf.....
As for the lack of Wario Land content, my guess would be because it's not a prominent series anymore. I'm not sure why they didn't pull more from Wario Land: Shake It/ Wario World (Especially in Brawl), as the art for that game is absolutely gorgeous. It probably had to do with time, and the import process. Fire Emblem received 0 extra trophies in Melee because of the time. Rare had all their trophies cut too. In the newest game, it's probably because the lack of new content. The last Wario Land game was released in 2008,
which is 7 years ago. I really hope they bring the series back, but I feel that the high production costs of Shake It, and the lack of sales might have scared Nintendo away from the series for now. Game and Wario might have scared Nintendo from a WarioWare title too, so I'm not sure what the future holds for our favorite guy. Sakurai has to focus on series that are relevant to Nintendo-- or retro series, which Wario Land is in the middle of. I'd personally put Wario Land in the same boat as Golden Sun representation. Not relevant, not retro so it's not a priority. Again, I really wish this wasn't the case as the Wario Land series has amazing platforming and level design.