I'd put it as an understatement if I were to say that Amaterasu has been by far my most wanted character for Smash ever since I started playing Okami back in 2019 (nearly 2 years ago what the heck).
She has everything going for her in terms of what she can bring to the table: a unique moveset utilizing Divine Instruments, the Celestial Brush, and possibly even the Godhood mechanic; a beautiful artstyle that makes for some of the most visually appealing stage options based off Japanese ink-wash paintings(If she does get in I'm hoping the Ark of Yamato is her stage); a godlike (get it?) soundtrack that's uniquely Japanese (or Ainu for the Kamui soundtrack). She'd be one of the most unique newcomers in all aspects of her representation.
Is she a lock for DLC? Oh heck no! She definitely has her hurdles, ranging from her series's niche nature to tough competition with Capcom's other possible picks (although I definitely wouldn't be against Dante or Phoenix tho). Regardless, she still has a chance and so long as that is fact, I'll be supporting her to the very end!
Here's some art I made in support of her inclusion in like an hour or something in Clip Studio and Photoshop: