I have a few interactions that I'm curious if I understand completely.
If I am using Zara, Renegade Recruiter and take control of a creature from their hand, will the "Return that creature to its owner's hand at the beginning of the next end step" follow the creature unconditionally? If I use Role Reversal and trade the creature from Zara (c1) with another opponent's creature (c2), will c1 return to the opponent's hand while I maintain control of c2? or will Role Reversal override Zara's condition?
Additionally, I know people often use Bazaar Trader to take control of creatures taken with "until end of turn effects" such as Act of Treason. Will this interaction still work with Zara? Bazaar Trader's rules text says it overrides temporary effects, but I'm confused on whether or not it would override the return to hand?
For your first question yes it will still return to hand. Unless the card changes zones like with for example an effect that would exile it and return it to the battlefield then it will return.
It will not override it. Cards like Act of Treason have change of control effects which are applied in time stamp order so Bazaar Trader is applied last and thus overrides the previous ones. Effects like return to hand at end of turn are not affected at all.
If I am using Zara, Renegade Recruiter and take control of a creature from their hand, will the "Return that creature to its owner's hand at the beginning of the next end step" follow the creature unconditionally? If I use Role Reversal and trade the creature from Zara (c1) with another opponent's creature (c2), will c1 return to the opponent's hand while I maintain control of c2? or will Role Reversal override Zara's condition?
Additionally, I know people often use Bazaar Trader to take control of creatures taken with "until end of turn effects" such as Act of Treason. Will this interaction still work with Zara? Bazaar Trader's rules text says it overrides temporary effects, but I'm confused on whether or not it would override the return to hand?
It will not override it. Cards like Act of Treason have change of control effects which are applied in time stamp order so Bazaar Trader is applied last and thus overrides the previous ones. Effects like return to hand at end of turn are not affected at all.