I thought about this question for a long time after reading all the other comments.
The only answer that came to my head was this; I want to come across as my seniors. I aspire to them. I want to be as good as them, so I try to duplicate what they do, including being a good sempai to those below me.
I know this is dangerous as eventually I need to become my own teacher, but I accept this is where I'm at in my training.
So I don't have my own self image as such. I just like having fun in the dojo.