I play swordies. By mid-S4 I had won a tournament set with at least one of each of the sword users, including Link, Ike, and Robin. In Ultimate I'm proficient with any character who wields a sword. I know the theory behind them, I know how to play them and how to beat them, and I know why we group them together as swordies.
Trust me when I say that DQ Hero is not a swordie.
Oh sure, he has a sword. And he has sword normals, most of which seem to be based on Link.
But he also has up to 16 specials.
16. Specials.
Stop for a moment and consider how many that is.
Your typical character has 3 tilts, a jab, a dash attack, 4 aerials, and 3 smashes. That's 12 normals. 13 if you count rapid jab separately from gentleman jab.
This character potentially has more specials than most characters have normals. We've never had a character like this before.
Ryu and Ken have an extra 4-5 normals, but all of them are close- to close-mid-range options (d-smash is a borderline midrange poke). And having more normals isn't the same as having lots of specials (though Ryu gets a taste of this with his Hadoken variants).
Shulk's arts give him access to different spacings/timings for his aerials, and make some of his specials/normals more or less effective in certain situations, but they don't change core move functions (up-b out of shield is the same hitbox and speed regardless of which art you're in, for example).
People are comparing to Robin? Please. Robin has 4-7 specials; 7 if you consider the different variations of Thunder/Elthunder/Arcthunder/Thoron to be distinct moves (which they are, but do remember that they are mutually exclusive options at any given point in time--you can't use Elthunder if you've got Arcthunder stored) and 19-20 normals. Robin is still a swordie at heart. She has some great zoning tools that are worth spamming, but Levin sword is integral to her kit.
Leaving out how likely each move is to be used/assuming an even distribution, Robin is about 25% mage, and 75% swordie.
The DQ Hero is almost 60% mage. This is the most magical a character we've ever had--we've had characters with mage aesthetics, like Zelda, but they were still not mages functionally.
This isn't a swordie. This is a mage. And that is hype.