ROCKMAN X
Keyser Söze
vergil lost to dante in dmc3 final mission. why do you think he left force edge and challenged mundus? pride,i guess. he was really shook up at the end cutscene:
'am i... being defeaten?'
seeing death of those around him,he felt life as worthless and decided to CONTROL EVERYTHING one day. he might have admired his father due to his grand achievements. as being his son,he might have wanted to finish where his father left off,in his family name. vergil did not show a lot of feelings but was far from having none. he did have a personality else he wouldn't have all those meaningful dialogs.
Well i think he was pursuing power in desperation and the "Pride" of his lineage and life but in the end when he dante asks him what is the real purpose of vergil pursuing power he himself is confused and yells at dante that he's wasting time but internally he realized what all he was doing had no purpose at all and so he just jumped off rather then just going with dante because he's too stubborn and prideful to do that
if he was really evil he could have easily dragged dante with him in the underworld