Both Monmo and Mikan might only be of the "whatever it takes" mindset because they were taught by Sakura.
Honyu I'd argue is very "pure" in how dumb she was, heading straight in without real prep or stealth, and only wanting to avenge her grandfather.
Suika is... technically acting out of kindness alone, ignoring her warped ideals, according to Metako she started out as a good girl.
I feel like we'd need to see a non-Sakura tutored (and not facility-trained) magical girl, and maybe some mazoku from outside of Sakura's co-existence zone to really get a grasp of "average devilishness.
I wonder what Budou's alliances/history will be like?
On the spot Morals scale, :
Least Morals: Suika(???) >>Sakura???>>Ogura>Mikan>Monmo/>リコ>Ryouko>Lilith>Shirosawa>Shamiko>also Suika :Most Morals