This noob has now reached level 42 which means I can finally equip the golden boots for Mandrake so that I can promote him to Gold. I was quite bummed to see that some equipment was level restricted.
Chapter 6 is also cleared. The rest of the day I will chase equipment for my 6* Hideo so also he can be lifted to Gold. I hope his Gold skill is good - if not, well, it was worth trying anyway.