I think he'd like her. He'd like Webby better though.

I think Tigress would basically adopt Webby lol

That would be really cute if she did, even though Webby is raised by a good adoptive grandmother and descendent, Scrooge. Lol

Lena would be more interested if she knew him as a dragon warrior in a magic book.

Kung Fu Panda does have mystical and magical things happened in the franchise, she might experience seeing Po as Dragon Warrior with Oogway's Staff can do as shown in the KP4 trailer.

Yes!