Yeah, she is. I have no shame in saying this, but I think Shantae is one of the most likable and adorable characters I have ever seen, not only in videogames but in general.
She is very nice and friendly (though Bolo may think otherwise) and always wanting to help people, and has some awkward yet cute quirks to her personality. She is also really good-looking, though that is not my main reason for liking her.
All in all one might say that she is the perfect example of the so-called ¨Nice Girl¨ trope, radically different from the many ¨jerks¨ that seem to be so popular in the gaming world nowadays. (Yes, I know Wario is not the most nice person in existence but I still like him because he's just well... Wario.) But you get the idea, right?
That being said, I must confess that I have some emotional ties to the Shantae series too, which is mainly caused by experiences in my early childhood that have been with me ever since.