Dungeon Meshi Rooms - Laios & Falin, Marcille, Chilchuck and Senshi
Found a few chapter covers that give a closer look into their rooms, erased the chapter names just to be sure
At least I think Senshi is in his room, if he isn't you get to see sexy Senshi for free.
Couldn't find any covers in Marcille's magic school room but added a couple under the cut that have spoilers.