Mage and Druid are both well suited to solo playing. Mage summons everything they need and has a strong pet to tank and exp for them. Druid does well with soloing by charming animals or kiting (depending on your preference) plus they can jump into groups as a healer. Monk is really group friendly, they can be great at DPS and tanking and most groups will take one even if they are bad at the class.
|