Mordekaiser is an any role champion ( Not ADC)
http://grabilla.com/0540f-1ede9fa9-e781-4bae-bb6b-3d6cb17e7d61.png
I have found him an exceptional Jungler and Support, not his usual roles but he can actually pull them off really well.
Support: He is naturally tanky with his passive and can poke down the ADC whilst also defending himself due to his passive. He counters engaging supports like Leona, Bitz and Nautilus since he can retaliate with lots of damage and turn the fight. Once he hits 6 you and your adc will most definitely win the fights because his ult deals a lot of damage which can't be ignored.
Build: http://grabilla.com/0540f-839fbd08-f8f1-4079-b704-b1f3f429b304.png http://grabilla.com/0540f-606521bb-bdec-49b0-8ca2-57b49ed44dba.png
Jungle: He has a weak early game pre 6 since he uses health to clear which slowly kills him. Even though his passive provides a shield he kills himself faster than his shield protects him. He can clear Gromp ->Blue -> Wolves -> Red with 2 health potions but will be very near death. Once he get's his spell vamp then he can clear with taking nearly no damage and also clear exceptionally quickly. Below is my build which is built around his lack of cc. I take 
for the slow since I have no CC, this allows me to ult then smite the most powerful enemy and if my team follows up pick up a kill and also have my enemies powerful body to fight with. After my 
I rush 
which perma slows target's who I ulted. This makes ganking really easy combined with my since the target is permanently slowed by 15% for 10 seconds. This is also great since my ult's range is really large. After those items I finish off with a 
and this complete's my slow build, this build brings a ton of cc into Mordekaiser's kit. A neat trick is to W a minion close to your enemies to slow them with Rylai's as they pass by.
Build: http://grabilla.com/0540f-6a8214d7-40d7-4e70-9e97-e1732e19693f.png
Last but not least is laning Mordekaiser , his most powerful role. He can either break the game by Ulting the ADC and killing him with Ult + E or he can be a tanky laner which deals 
of damage. I build him tankier top lane so that I can contest with the enemy top laner for survivability. Where as mid my job is to burst as fast as I can and run behind my team. So I build a 
top so I don't die too quickly or at all. Where as I build pure AP damage mid especially with 
being a broken Item since it proc's with all his spells and really just does unexpected damage. 
can be taken instead of 
but I prefer since they tend to build Heavy MR.
http://grabilla.com/0540f-b57d49b1-0d3f-4466-9b85-7f893aaffce4.png
