Possibly the same artist as mashimaro (masimarodaaaa). Alternately, the similar name could be a coincidence and the similarity in style a result of both being heavily influenced by Watanabe Akio.
https://www.pixiv.net/users/15867481
https://www.pixiv.net/stacc/masimarotabetai
https://twitter.com/marshmallo5959
https://twitter.com/msmrdaaaaa
https://twitter.com/intent/user?user_id=1082184171278106625
https://twitter.com/intent/user?user_id=1805780084638498819
https://msmrdaaaaa.fanbox.cc
https://www.pixiv.net/fanbox/creator/15867481
https://sketch.pixiv.net/@masimarotabetai
https://skeb.jp/@msmrdaaaaa
https://misskey.io/@msmrdaaaaa
https://misskey.io/users/9c88spy4gp
https://bsky.app/profile/msmrdaaaaa.bsky.social
https://bsky.app/profile/did:plc:qxb7swl6gv7zbwj46ypkntq3