Alone no, at this point I find him one dimensional and a typical shonen protagonist who is (a) hot-headed and (b) is good at fighting or becomes good and (c) flips their **** against any sort of injustice and fights to resolve the issue no matter how realistic their chances might be. I find him somewhat enjoyable in SM because he bounces off a variety of figures, the shy timid girl, the action girl, the father figure, the nerd, the equally hot-headed friend, etc etc, there is just a variety of interactions to be had.
With that in mind, I also don't know how I would feel about a singular companion. I think they (as in the writers) would have to really nail the personality to mesh with Ash's well. Two hot-headed kids travelling around would be boring af, but a frosty yet calm character could be the perfect compliment to him.