What would you do if you had a do-over? Would you fix relationships with people that you took for granted in the past? Would you distance yourself from a situation that caused your death? Would you try to become rich using the knowledge that you have? Whatever the case, most of us would certainly do things differently either because we want to avoid a bad situation or to move towards what we believe will bring us closer to happiness. 

This is a selection of series involving a regressor or time travel element, be it in fantasy, science fiction or other settings.