Yeah, it still doesn't work.
I got an ask about this on Tumblr (have I become some official authourity for Rosalina knowledge or something?...). My thoughts were the response:
"I just finished, and it’s still wrong.
I won’t re-post my old comment, since some of it is now irrelevant since they’ve changed their theory to Luigi being Rosalina’s father. But I’ll briefly state things that pose problems even there:
-Rosalina IS ambidextrous. MatPat is just blatantly ignoring this fact and chalking it up to “right hand bias” in her promotional art, but he neglected to mention the in-game instances where Rosalina uses the wand in her right hand (which includes two very important cutscenes), and the promotional renders where she holds it in her left hand (see her Smash Bros poster).
In fact, I have an entire post about this, and it’s not even every instance. So basically, the genetics part of his theory is gone out the window:
http://sonicbrawler182.tumblr.com/post/93065941662/fun-rosalina-tidbit
-NPC Luigi has an implied crush on Rosalina in Galaxy. I don’t think Nintendo wants to promote incest.
-Even if you want to argue that the Player Luigi is the father of Rosalina, there is no proof that it’s either particular Luigi in the Wii Message Board photo, for starters. Plus, the implication of that photo seems more like they are going on a date, linking in with his implied crush on her (note that this crush has only ever been in the original Galaxy, Nintendo has not touched on it since). If you look at Mario’s equivalent to this photo, he is on Good Egg Galaxy with Peach and the Lumas, and we know for certain that Mario and Peach are romantically involved. It’s basically Mario taking Peach to a lovely place she’s never been to, and meeting some new creatures. The Luigi picture has him with Rosalina, visiting the Mushroom Kingdom (a place Rosalina hasn’t been to - no, I still don’t believe it to be her home, at least not this iteration of it), meeting some Toads (specifically the Toad Brigade). Luigi is taking Rosalina to a lovely place she hasn’t been to and meeting some new creatures. It’s a direct parallel to the Mario and Peach picture. So I do in fact consider it a simple friendly date, not some father/daughter reunion.
-There is one elephant in the room here that the theory ignores:
Official artwork.
Also, it should also be noted that their claim of “Peach displaying absolutely no affection for Mario” is untrue even with in game material. Mario’s winning animation in Mario Power Tennis depicts Peach walking up to him on the podium and kissing him (she’s not bothered by him winning because they are in love and both mutually benefit from each other’s victories). In the latest “Mario & Sonic” game, Mario and Peach have a special win animation together. Even the the RPGs and the story mode of M&S at the Winter Olympic Games, Peach displays a very specific affection towards Mario. She has a lot of respect for him and repeats plenty of times that she absolutely loves being around him.
Heck, the two have a very romantic reunion even in Galaxy, holding onto each other and swirling around and what not.
No matter what way you swing it, Mario and Peach are a couple. And Luigi has only ever displayed a romantic interest in Daisy and Rosalina herself.
Honestly I could go on and on upturning this theory, but this is all that really needs to be said.
This entire series was completely underwhelming. It’s just cashing in on a popular franchise and a popular character, and considering some of MatPat’s best theories, I don’t think he could overlook such simple things."
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EDIT: I love how the inside of Rosalina's gown not only proves more of her amazing and completely off the wall goddess powers, but makes fan art of Rosalina upskirts
completely safe to post.
"I can show you the world...."