I have watched all of those performances and could add more but non of them i would say is Mr Sinister worthy... The closes actually in my opinion to Sinister was probably in Fifth Element as Zorg... Here is my run down.
Fifth Element - his character was currupted by "Him" the darkness that was heading towards the earth. In comparrision to sinister who you could argue isnt this what Sinister did with Apocalpyse well... No. First off Sinister used Apocalpyse, he did not fear him like Zorg feared that darkness.
Leon The Professional - Personally again another one of my favorite films staring Gary Oldmen, but to me he played a very steroe typical currupt police officer. His character in this was a wreckless drug taker which means he took risks... Sinister is more reserved and doesnt take risks.
Lost In Space - although he played a Doctor, he was also a weakling, he was weak minded and didnt see the betral of the people he worked for, yes he is smart but not sinister smart. i mean yeah he became that creature but still that was by fault not by his own means. If you were to state sinister as chess his peace would usually be the queen where as Gary Oldmens character in Lost in space was a Pawn....
True Romance and Romeo Is Bleeding - nothing like Sinister i couldnt make the connection there.
Lets see what else?
Harry Potter - his character in that is lead to believe he is a maniac, someone who would take risks but again Sinister doesnt have any effection for people. He wouldnt commit the things he do for the side of good, hes just pure sinister. Self in duldgent so no comparrision
Hannible - Oldmen was just a twisted gone insain through isolation and bitter man who was paralized and seeking revenge... Again sinisters intent is self indulgent, he doesnt take revenge. he is usually the instigator and never looks back.
Bram Stokers Dracula - Creepy Oldmen played Dracula... now of all the movies oldmen has been in this is near to what i would of said is near sinister, someone who renounces his own faith, becomes immortal... but thats it, Dracula again wants revenge even after all this time but all his enemies are dead so he takes it out on whoever he can. Elizabeth he saw his deceased wife Elizabetha but again... Sinister - sinister intent, never look back at revenge...
So to summerize... NO YOU HAVENT CONVINCED ME... LOL
But this then brings me to Robert Knepper and the three roles ive seen him in that would make him perfect for this character.
Prison Break - T-Bag - as this character he portrays a guy who only thinks of himself, someone who is living the moment as and when it happens and doesnt think about tomorrow. When he does something it is always for self gain. And he will go to any length and i mean any length no matter how bizzare, insain, sick or dirty he will go there to achieve what he wants. - That is sinister, if T-Bag was a doctor from england think about it, T-Bag would tie a mutant to a table and inject it with chemicals to see if it worked, T-Bag would use his science for his own gain... But thats not all, T-Bag is smart, but in a sense of street smart. He isnt stuck in his world, he knows how all worlds work, hes found the connections and knows when people would try to stab him in the back and he will go about any means to make sure there is no risk that will stop him. I could talk more about how right he is as T-Bag but lets move on...
Hitman - Yuri - Brilliant performance. What really attracted my attention to why the way Yuri worked. He was someone who knew the situation and knew what was going to happen. However the best part, the bit that you really saw him as sinister believe it or not was during the bathtube torture scene, he has to make the call or loose his life, Now sinister is rarely trapped in a situation where he has to talk his way out. But if he did, he would side with the enermy to save his own skin. This reminded me of Sinisters relationship with Apocalypse, yeah he saved him but he would stab him in the back.
On to
Transporter 3 - Johnson - now this is a real treat to see Knepper in his normal accent, believe it or not he doesnt have a natural southern accent. His normal voice is just a typical northern american accent. Typical hollywood style. But i watched on youtube some of the other roles he has done and he is a master of voices, you find a video of him speaking with british accent and you'll know that this is sinister. But back to Transporter, He plays Johnson and like all his characters he plays the bad guy, but unlike T-bag or Urich he is just a regular guy. And this guy is involved with a company that has evil intent, he is there just to settle the deal and he will do anything to settle it. Again this shows that he can play a character who can organise a situation, a plan-ster someone with a plan.
So as you can see Knepper i have only seen him in three things plus youtube vides of his other roles. check them out He not only looks like Sinister, HE IS SINITER.