Blitzday

Blitzday is the het ship between Blitzo and Verosika Mayday from the Helluva Boss fandom.

Canon
Blitzo is Verosika's ex-boyfriend. Apparently, she was very much in love with him to the point that she had his name inside a heart tattooed on one of her arms, though it is now crossed off. They broke up after Blitzo stole her car, took it out on a joyride and left her to pay their hotel bill while he maxed out her credit card on "shitty horse-riding lessons". Verosika likely never wanted to see Blitzo again after their relationship ended, but now that they are working in the same place, she's determined to do everything she can to get even and get under his skin.

Neither of them ever say anything remotely positive to or about each other. Instead they constantly strive to outdo each other in insults as seen in "Spring Broken", when Blitzo calling her a drunken whore and Verosika being quick to insult his sister for being in rehab. Verosika not only hates Blitzo, but also those who are associated with him in any way; such as his family, Millie and Moxxie, the latter whom she and her bandmates sexually assaulted after he tried to reason with her about the parking lot.

Verosika appears as a hallucination in Blitzo’s bad trip with the Honesty Gas in “Truth Seekers,” being one of the few people who left an impact on Blitzo emotionally regarding his defiance against all affection and intimacy in each of his relationships, even when he genuinely cared about them, out of fear they will leave him in the end and he will be alone. She is among those who mock him for turning his close ones away and is quick to point out how he pushes away all notions of intimacy, heavily implying this is what actually brought the end of the real Verosika and Blitzo’s relationship. It also implies Blitzo may feel a bit guilty about the end of the relationship, but little is shown.

When the real Verosika appeared again in “Ozzie’s", she mocks Blitzo through song after he defends Moxxie’s singing from Fizzarolli and Asmodeus. According to the song, Blitzo did very little to reciprocate her actions during the course of their relationship. She then reveals the full extent of her hatred for him by calling him a selfish, reckless, heartbreaking freak, glaring at him heavily as she pushed him away again. This further implies the extent of her feelings for him when they dated, hinting that she was deeply hurt by their breakup, and this further fuels her hatred for him. Additionally, Blitzo was shown to have a photo of them back when they were dating, implying he may have cared about her as well.