->''"I've seen a part of myself no man should ever see."''
-->--''Series/StarTrekTheOriginalSeries'', "The Enemy Within"

->''"You can defeat me, Scott. But can you defeat yourself?"''
-->-- '''Gideon''', ''Film/ScottPilgrimVsTheWorld''

->'''[[VideoGame/FinalFantasyVII Cloud]]:''' You don't know me!
->'''Sephiroth:''' I know... because I ''am'' you.
-->-- ''VideoGame/KingdomHeartsII''

->''Join now with your better half!''
-->-- [[spoiler: '''Vanitas''' to '''Ventus''']], ''VideoGame/KingdomHeartsBirthBySleep''

->'''Bad Ash''': I'm Bad Ash! And you're Good Ash! You're a goody-little-two-shoes!\\
'''Good Ash''': Good, Bad. [[PreAssKickingOneLiner I'm the guy with the gun]].
-->-- ''Film/ArmyOfDarkness''

->''"[[FauxAffablyEvil Aw, and I thought we were so close...]] So nice to finally meet you, face to face!"''
-->-- '''Ghostfreak''', '''''WesternAnimation/{{Ben 10}}'''''

->''"On three occasions have I witnessed these beasts do battle, and each time, I have been sickened. Not by their methods, nor even by the terror they have wrought within our own ranks, but by the fact that to look upon a brother of the 13th Company is to witness the beast within us all given hideous form."''
-->-- '''Inquisitor Asmorales''', '''''TabletopGame/{{Warhammer 40000}}''''', on the Wulfen

->''"I am the son of Aku's magic! He has looked deep within you, and has spawned ''me'' from your own burning hatred! I am your dark side, and I possess all the powers that you wield. And I have only one purpose in my existence - to destroy you."''
-->-- '''Mad Jack''', ''WesternAnimation/SamuraiJack''.

->''"[[ArcWords I am a Shadow... The true self.]]"''
-->-- '''Every single Shadow''', ''VideoGame/{{Persona 4}}''

->I am a being woven from your mind — your heart — your soul! Can you not see—? I am you! And I fear that we may not both... survive!
-->-- '''Sandman Franchise/{{Superman}}''', ''Comicbook/KryptoniteNevermore''

->'''ComicBook/{{Starfire}}''': Listen. When [[ComicBook/LexLuthor Luthor]] flew off-- I was pretty out of it, but I thought '''you''' went after him.\\
'''ComicBook/{{Supergirl}}:''' I '''did'''. In a way. But it wasn't '''me'''. And it's not a '''good''' thing.\\
'''Starfire:''' What? Like an evil twin?\\
'''Supergirl:''' I... don't know. More like it was part of me.\\
'''Starfire:''' I have a sister. They call her '''Blackfire'''. I feel like I'm responsible for '''every''' bad thing she does.\\
'''Supergirl:''' Yeah, well, in '''this''' case... I think I am.\\
'''Starfire:''' Do you know where this... "she" is?\\
'''Supergirl:''' I do. She's been in my head... Maybe... '''All my life'''.\\
'''Starfire:''' And now? How do you feel having her out?\\
'''Supergirl:''' The truth...? Relieved.
-->-- ''ComicBook/Supergirl2005'', ''Girl Power''