All of what was already said to you, but because I have myself had a couple sketchy landlords I also have to add some things: Is this person going to be signing a lease? If you don't make them sign a lease and they're just renting month to month, technically provincial eviction rules don't apply to you anyway. The landlord tenant board basically considers them a "guest" in the space and you can actually go so far as to have police remove them -legally- the same day you tell them to leave if you want to choose to do so. You'd be one hell of a jerk to do it for any reason not at a severity level like damaging the property willfully or selling drugs out of the house, but that IS actually your legal prerogative to do and there's no legal tape stopping you. (side note, seriously we barely have enough money to eat after rent and bills, the stereotype that we're all drug addicted tax sponges who don't understand what it is to work hard is an excuse that normal people often use to not let themselves feel bad about being bias. Your chances of having a problem roommate on odsp due to drug use in any capacity are incredibly remote.)

If you choose to go the lease route, then all the normal eviction rules will apply to you/the owner of the house you're all staying in (exception being if the owner decides to move into the home and live there, that's its own basket of legal goodies). Right now due to coronachaos, you will not be able to legally evict someone for not paying rent. However as has already been mentioned, we're in a very precarious financial position and depending on your location, affordable housing is in damningly small supply. I don't personally know anyone either who would consciously jeopardize their stay in an affordable space, pandemic or not. Obviously there are pro's and con's to either the lease or no-lease route, but either way you are no more likely to have issues with a person on odsp then you are with another student or a working professional.