Hazbin Hotel is an adult animated comedy series focusing on Charlie Morningstar, the princess of Hell, opening a hotel for sinners in an attempt to reform them. Helluva Boss, a YouTube spin-off to the series, exists in the same franchise and universe and follows Blitzo (the O is silent) as he attempts to run a start-up killing company.
Stolitz is the canonical ship of Blitzo and Stolas. Blitzo and Stolas met when they were both children and Blitzo performed in the circus and the two spend time together playing, which was arranged by Stolas' father.
Twenty-odd years later they met again and in exchange for the use of Stolas' Grimoire, with which Blitzo can enter the human realm, the two started sleeping together once a month. Over time, both Stolas and Blitzo started to actually care about each other and their transactional sex stopped when Stolas gave Blitzo an alternative way of entering the human world and asked him to be with him because he wanted to.
Blitzo, caught off guard, couldn't answer quick enough and Stolas took that as a rejection. They are currently both hurt and in desperate need of communication.
Stolitz is the most common pairing in the Helluva Boss fandom, seeing as it is the canon relationship of two of the main characters.
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RadioApple is the non-canonical ship of Alastor, the Radio Demon and Lucifer Morningstar. When Alastor and Lucifer met for the first time, they did not get along, Lucifer seeing Alastor as a rival in his relationship with his daughter. Alastor also doesn't hold back in annoying Lucifer with his insecurities and acts like he cares more than he does.
RadioApple is currently the most popular ship with Alastor, probably as rivals to lovers is a very popular trope.
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