A Multitude of Michaels

Inhabited by check and counterfoil, my head is full of squatters – what a mob! One Michael’s eager for his daily toil: another Michael can’t abide his job. There’s one of me who’s frugal, prudent, wise, and one you wouldn’t trust to walk the dog: one version tries it on with petty lies, while one’s as stable as a fallen log. One talks like Robin Williams on a high, but one’s as muted as a manatee: so how can I my inner self descry? Establish which, of all of them, is me?