Flippy's a character that is severely underated on my opinion
Everyone always talks about how Petey had an amazing character growth, but everyone tends to ignore Flippy's own growth. He starts out as a fish that is said to be evil (my theory is that Flippy was one of those fishes that eat other fish if they share an aquarium with them) and after an unfortunate chain of events, became fully sentient and super smart to the point of developing psychonectic powers, freaking died! Then came back to life as a cyborg fish with the only objective on destroying everything.
There's also a great parallel with Flippy and Dogman, both suffering a nasty accident that caused their death only to be bought back to life, but while Dogman was revived and treated as a hero Flippy was treated as a monster. And there's also the detail that Flippy wasn't fully himself on these moments, because the supa brain dots he ate basically made him angry and he wasn't on fully control of his actions (which means that he probably had an overdose and was most likely addicted for a few time until his fully recovery).
And is worthy mentioning, Flippy almost won! He's probably the Dogman villain that came the closest to actually winning, if Lil Petey didn't befriended him there's was probably no way he could be stopped. I really wished he was more developed in the Dogman comics, he's such an interesting character and would be so cool to see more of him especially his relationship with Petey and Dogman considering his daughter is constantly hanging out with them, plus he could help with the fight with his mind powers (i don't know for sure if he still have his powers, but if Molly still have them after turning good then is very possible he have as well)
Also, worthy mentioning that the man is raising 22 children. It takes a boy to be a father, but a man to be a single mother