I love this character and I would main him if I could (and I did when i first started playing) but he has really unfortunate flaws. For one, his shield leaves half of his body exposed, which I'm assuming is a bug because it literally leaves his head, nose, and limbs vulnerable even without decay. So along with this unfortunate bug, he has one of the, if not the slowest tech roll and spot dodge in the game. So his defensive options are abysmal for no good reason, especially when he's one of the lightest and easiest characters to kill in the game... Additionally his uair, nair, and bair cannot be l-canceled for whatever reason so that really limits you to fair most of the time. His fair, nair, d-tilt and f-tilt are amazing moves, but they aren't enough to make up for his fundamental flaws.
It's really unfortunate because if they fixed these issues before release I think he would definitely be a viable, luigi-tier kind of character. His moveset is really solid but he has so many core disadvantages that he's essentially just broken (probably the last character they worked on). For example, if a fox nairs on your shield and shines, you will almost definitely get poked and you really have no tools to avoid pressure other than his good wavedash.