Sheriff / Invest : 100% definate clues, otherwise influenced by other roles.
Survivor : He survives, is neutral and can't do other then to take hits.
Amnesiac : He is very powerfull, but can be appropriately balanced with setup options.
Executioner : He can turn to Jester, and Exe has a goal not getting himself killed.
--- Starting as Jester however, leads to trying to get yourself lynched D1/D2.
Serial Killers almost always kills someone once per day including roleblockers.
Mass Murderers has the ability to kill everyone visiting a house, giving a chance from 0 to 6+ kills in a single night.