Alexid will likely try and steal a music player and pickpocket some guys before stumbling apon the fights where he would like to battle for some extra cash but realise he lacks combat potential so he would roam around and likely get outside the city and go's explore some cave's

isaac... I dont know
I guess he would likely just sight see at some monuments or something after having looked in the shops for stuff to use for his magitech stuff

I can add some extra stuff to reply about though. The reaper for example