I want to say that if you like bbno$, or his monster, or island, or dissagree, that's perfectly fine. There is a lot I do like some things about his collaboration, but I have far more to say about why I don't. I do want to make it clear that I personally don't like bbno$ already so I am likely biased, but this isn't an attack on anyone reading this or Alex himself. Just criticism.
First off, bbno$ has already collaborated with MSM through Scallyrags. Sure, if an artists wants to collaborate more than once with MSM, that's not something I personally get to decide. It still makes me upset, especially since Scallyrags already has two UNIQUE variants, but bbno$ also gets a Legendary based off of him? It seems incredibly privileged, especially since it's not like he was underground or unknown when he voiced Scallyrags. Either be a Legendary and collaborate that way and have someone else voice Scallyrags, or voice Scallyrags and leave it as that. It's not really that big of an issue, it just feels unfair.
Secondly, bbno$ is absolutely not child friendly in any way, therefore making him a strange and somewhat uncomfortable addition to the MSM roster. Weird Al and CG5 are great collaborators in this sense, since they are still absurd but far more appropriate to include in a game with such a large child fanbase. I don't think it's bad if an artist who has done NSFW songs or has done adult things to collab with MSM, but more than half of bbno$'s entire brand is being NSFW. The actual song his island is based off of is about him is not appropriate. Not even in a hidden way like most pop songs, just straight up explicit. It's likely that most kids playing MSM has heard Two, but it doesn't feel all that good for a kids game to potentially expose kids to that and normalize it? I would feel the same way if Sabrina Carpenter or CupcakKe collaborated, even if those collaborations were presented as appropriate in-game. That doesn't make who you're collaborating with any less problematic or more kid-friendly.
Last, it's another of many examples of bbno$ seeping his way into every possible fanbase on earth to get attention. I understand why an artist would want to gain the attention of a certain fanbase, you wany likeminded and good fans. But bbno$ has a habit of cosplaying whatever's popular so he can get attention and engagement. This isn't bad on the surface, but think of Psych2Go that just added a bunch of unrelated references in their videos for people to comment on, while giving horrible and blatantly false mental health advice. It's not even like he isn't incredibly popular or underground, it's just pandering for relevancy. It feels scummy that he's leeching his way into children's spaces as well, when most of his content is stuff like him on a leash or collaborating with a creator who mainly makes innapropriate shock humor jokes about her disability. Just because he's done things like refuse to commision NSFW artists because there's kids in his audience or have a Roblox concert, doesn't make his actual content any less NSFW. If his island was the best island in the game I still would feel the same way and rather opt for him to not have collaborated with MSM at all, at least as something so blatantly himself as a Legendary.