Any drawback doing too much stair climbing?
If you do it before running, your muscles can be over-stressed at the start of a run, increasing risk of impact injuries. So make sure to give yourself recovery time after stairs before you do a hard run again.
Done in this way, you can build up your support muscles which will actually decrease the risk of running injuries.
Not really; he matches the description of one of the minor henchmen that precedes The Beast.