Oh my goodness why did I not see this sooner. I'm 24 days late. Hello anon. This is actually a really good question and a good time for me to mention that Puyo Puyo did have a collaboration with the Japanese Racing Assocation called umapuyo and you have really good combinations like Raffina with Tokai Teio and Schezo with Meijiro Mcqueen

But my personal opinion for fave umas of my fave puyos
- Amitie: Buena Vista for sure. Like 100%. The vibes are perfect and Vista even has the childhood friend thing going for her in her career which Amitie lowkey feels like even if she and Sig aren't childhood friends
- Raffina: Kawakami Princess or Gentildonna or King Halo. I think Gentil would be her top fav
- Sig: Seiun Sky or Neo Universe. Seiun is the most Sig-core umamusume
- Klug: lowkey hard to place but I can see Tanino Gimlet, Agnes Tachyon, or Chrono Genesis
- Strange Klug: Still in Love, Red Desire, or Tanino Gimlet (and if she realized Klug had the same faves as her she'd be pissed off)
- Marle: Hishi Miracle
- Squares: Air Shakur...not sure why this is like a vibe thing. I also think he'd like KS Miracle.