I have recently come to the conclusion that I want to approach manager positions within my current company. We are a large multi-national company, mainly positioned in Europe.
I am considering asking this one coworker, who is a manager - but not my direct manager, to be sort of my "mentor" in pursuing this goal. The reason I have chosen him, is because he made the jump inside the company from employee to manager. We have also worked together on a few projects, with him as project manager. On these projects I have always admired his personal and professional skills. On a personal level we also connect quite nicely.
We do not have any sort of official mentoring inside the company, which is why I said "mentor" with brackets above. Would it be considered odd/unprofessional, if I approached him about this? If no, how should I approach him about mentoring me towards a manager postion?