My top 10 Bosses from Resident Evil. This list was made by me and the bosses where chosen by which ones where the hardest for me to beat, (number 1 is an exception). Tyrant: this includes Mr. X since he is a Tyrant.. 9.Nemesis. Jack Krauser. 7.Alexander Ashford. 6.Ricardo Irving. 5.Excella Gionne. William Birkin. Alexia Ashford. 2.Sergei Vladmir. Albert Wesker.