Yes, kept it w/many of other fish including their relative leaflip soapfish. Never had them soaped-up toxic slime. It is, i believe, their defense mechanism to deter predation. Have kept with triggers also and lionfish w/o problem. Only scenario I could think of when introduced to tank for firsttime where other fish might pke around and/or agitate the soapfish out of curiosity. Just monitor water conditions and observe the behavior of all the fish including new arrival.
For this reason, I've always let new arrival ajust to my water w/o being physically bullied by inmates. Like I said, isolating in clear container or even floating lage, clear plastic Jar w/ holes is better than adding directly into tank to attract attention and bulliness of inmates. It is actually one of easier fish to keep.
As far asf fish personality goes, I find no different from us in many ways (territorialism, competitions, etc), LOL.