My Yusuke's build is like: mabufudyne, brave blade, charge, hyakka ryouran, arms master, spell master, ali dance, evade fire I don't keep his vorpal blade because it sucks. I recommend using the black moon R to give him apt pupil to improve brave blade's crit rate and free St+8 bonus
Yes, I used mod menu to teleport to mementos on the day of fates. One shotting the reaper with myriad truths or a showtime with country maker are both doable without mods however.