Writing this in time for the hellaverse panel at the SDCC.

So, I dunno what will happen in Hazbin S2 but many folks think that Helluva Boss S3 is going to end with Octavia forgiving Stolas

But I'm gonna make a REALLY bold prediction here: Via's gonna be the big bad for season 3, by getting the Adam treatment, for better or worse 

Basically, she'll be OR will become a powerful, boisterous and self-absorbed asshole who hates her own father for all the wrong reasons. Her song “I'll be okay” from the S2 finale was in actuality nothing more but a song made solely to spite him to make herself think she’s better than Stolas. She was always a spoiled brat from the very beginning, but we never saw that because we only ever saw things from Stolas and Via's perspective. Octavia always knew that Stolas was being hunted, and decides to use her new acclaimed throne to go after him.

Her angsty emo persona was either just a phase or an act. And like Adam, she gets her comeuppance, alongside Stella and Andre, as a result after she nearly comes close to killing Blitzo, enraging Stolas to the point of getting his powers back as a result

Of course, Via won't be killed like Adam, obviously. Instead, Paimon will return to save Stolas and make amends for treating his son poorly for so many years, and with the help of Vassago somehow, Paimon is able to get Stolas to reclaim his throne (With the I.M.P crew getting the chance to live with him), but not without booting Via, Andre and Stella away from the Goetia nobility, sending them to exile and even stripping Via of her magic, but this will obviously not be the last time we hear from them. 

Stella, Andre and Via will try to go after Stolas and Blitzo once more eventually. In the meantime, Stolz and Blitzo form a new family with Moxxie, Millie and Loona after Stolas reclaims his throne, further emphasized with Millie's own yet to be born child, with Stolas and Blitzo becoming godfathers. 

All this will result in the hellaverse crossover when Andre, Stella, and via join forces with striker and moxxie’s dad, or they themselves go after the I.M.P. crew once more by attempting to kill Millie while still pregnant, promoting the crew to find refuge in the Hazbin Hotel

BONUS: Stella will come out as Bisexual.