I've noticed my earlier frequently used and actively updated pedalboard has received less and less attention since kemper arrived in the house. And now as my personal go-to profile collection has improved significantly within a year the external dirt boxes seem to become most unemployed of 'em all. This doesn't mean they don't work well with kemper - quite opposite - but in case I need a different amount of gain (or different gain structure or voicing) there usually is such amp profile that does the job even better or even with some similar pedal used in profiling.
The exception confirms the rule of course and sometimes is just pure fun to play with dirt pedals also and discover new sounds using them. One of my favorite dirt platform is Bogner Shiva profile - set clean or slightly on the edge. Then putting e.g. Mad Professor Sweet Honey Overdrive (strat middle pickup, tone slightly off) or customized Lovepedal Englishman in front of it produce some unique sonic goodness.
Aside from OD boxes I'm seeing most advantage using external univibe, fuzz and delay. Out of these the external delay (Roland RE-20 or Strymon El Capistan) is only must have for me as I need to have one in some songs pre-effects that is not (yet) supported. In this case I put it in the mono loop as a first pedal and control it with midi. For fuzzes I'm using the Guitarsystems Sam's FuzzTool Jr custom hybrid (killer fuzz!! Replaced oxfuzz and mjm..), Skreddy Lunar Module, Fulltone Catalyst and Fulltone Octafuzz. THE vibe for me at the moment is Fulltone MDV3 Deja Vibe.
Here's a pic of the recent pedalboard test setup. Some nice pedals in there on there own, but not that mandatory anymore with KPA.
One great thing (out of many) about kemper is that it seems to work well with outboard gear in front of it - just as the real profiled amps would do. And therefore a good starting point for a good 'pedal platform' profile is to use one from amp known for its pedal friendly capabilities. In addition to Shiva, I've found also couple others working well with pedals such as Fender Twin and Bogner Goldfinger. There was probably some other gems also, but don't have kemper in front of me just now. (edit. Of course need to mention the Marshall -- fuzz into one of these good older JMP or Plexi =