Well, I was just thinking about this some days ago. If I have to be honest with you, there are many artists (mostly mangakas but sometimes even painters such as Michelangelo) who I generally look up to and some that I straight up see as mentor figures.
I took a lot of inspiration and elements from their narration, their characters, their stories, their artstyle and the composition.
I got some elements from many brilliant mangakas such as Togashi, Isayama, Kishimoto, etc., as well, but the two main artists which I mainly base my creation on and I see as "indirect mentors" have to be Hirohiko Araki (creator of Jojo's Bizarre Adventure) and Kohei Horikhoshi (creator of My Hero Academia).
As you can see, my artstyle is mainly based on Araki's, the facial features, the anatomy of the characters. I also took some story elements from Jojo's (and some other things that will be more evident later on )
Moving on to Horikhoshi, I'd say that his narrative has impacted me a lot. The emotional moments of the series, coupled with the psychology of the characters is something that changed my writing, especially when I first started watching the anime.
I slowly started having a different approach with my narration and made it more... emotional and alive.
Art-wise, I really love the way he draws hands, because I love drawing them as well, but I'm not that good . I'm starting to improve a bit though.
I also tend to draw kids in the mha artstyle, so yeah.
In conclusion, the reason why I see these two artists as mentor figures is because I just need to keenly observe their art to improve and adapt. Just by looking at Hori's way of drawing hands I started improving on drawing them without any reference! Or by looking at Araki's anatomy I started understanding it better.