UGH, JUST KILL THE DUDE HES CLEARLY EVIL WHY ARE YOU JUST KEEPING HIM ALIVE HES JUST GOING TO CRAWL BACK AND KEEP BEING EVIL! alright, now that thats out of the system, why really are they keeping this guy alive? he clearly has no remorse seriously harming and possibly killing others, and no one else seems to have the super saiyan levels or the balls to seriously injure him, so why dont the MCs? well, for one they could want to "bring him to justice", but due to the previous content of the series, i will predict that they dont do that. because that would be unsatisfying as fuck. they could want to play with him like a cat plays with its prey, but they dont seem to be the type of mc to do that, and this isnt a revenge manga. the third and final option that i dreamed up slightly after midnight, is that they were planning the whole thing and the elf is actually an illusion or something, just to make the ginger despair just a little more before he's inevitably banished to the shadow realm, but in manga like this. that is rarely the case due to authors not wanting to fall for too many cliches yet using way too many of the same as other authors. i formally predict that girl mc will use her healing magic to heal herself, but not have enough super saiyan levels left to beat ginger, only to have the side character of the day (or the slave) enter and with their help, beat ginger, but probably not enough to capture him, but enough to make him wag his fist at those meddling kids