Something seems very off in this situation: Todd has been living in this apartment all by himself for a long time (since his rent is only half of market rate) and suddenly he's willing to get a roommate.Frank is willing to get into a roommate situation, which only happens to save money or because people become a couple.Now that Todd moved out, Frank would be willing to pay all of Todd's rent rate, without roommate?

Only the entire lease can be terminated.If one of the two roommates wants out then that entire lease is terminated and the remaining roommate applies on their own.

Out potential new tenants just sent me the following email: "We're considering a third roommate - a female adult without children.

Which leads me contemplating purchasing this one cash and using my VA loan for a SFR in a high rent area where I can get roommates.

For this reason, I am considering hiring a close friend to be my "roommate", free of charge, so long as they will handle all maintenance and upkeep needed for the property (I have some friends I trust that this should sound appealing too), I would reimburse for all materials bought for repairs (so long as they called me for anything over $50).

My roommates and I were lucky enough to never have problems paying the rent.

both spouse, all room mates are should in the contract and your agent should pull reports for all who will be in the contract.

In my opinion 2/1 will attract younger families or roommates, which can be fine depending on your screening process.

But this saves me a lot of time communicating and showing the unit to prospective tenants.My girlfriend (before I met her) had her security deposit revoked when she abruptly moved to a new apartment because a friend of hers needed a roommate.  

In 1988 I bought my 1st house & got a roommate.