Hal "Tighten" Stewart is the yandere to Roxanne Ritchi from the animated movie Megamind. He is voiced by Johan Hill.
Before becoming Tighten, he used to be a sweet, dorky guy working as Roxanne's cameraman. He had tried multiple times to ask her out, only for her to turn him down. He's not that popular and spends what time he has on his own playing video games.
He's incredibly possessive of Roxanne. After she rejects him as as superhero, he initially gives up being a superhero and turns to a life of crime. In the climax, he tried killing Roxanne twice for spurnning his affections (once by tying her to a tower he tries to destroy and the other being him throwing a car at her). Even before he became a super villain, he was possessive of her, trying to chase away Megamind who was disguised as Bernard.