Metal Seadramon, Deramon and Floramon are all Data types. All three started out as evil, and Metal Seadramon was destroyed by WarGreymon's claws. Deramon and Floramon was both henchmen for Puppetmon, but change to good.
Data Digimon are meant to be neutral and can go either way. Mainly, though, Data Digimon just want to be left alone and will do whatever it takes to make
themselves happy. Wizardmon is a Data Digimon, for instance, but although he joined Myotismon's army out of loyalty to Gatomon (a Vaccine Digimon) and help her find her destiny, he still made it clear he's not exactly a
good guy by agreeing with Tai that he shouldn't be trusted right off the bat. He may have helped to save the day, but he didn't do it with the fate of the world in mind.
Orgemon started out evil, but after the Leomon battle, he became a good Digimon as a virus type.
Nah, he's still an as
shole who still wants to fight Leomon and be himself. He's just become an ally of the DigiDestined now, but he was aware he was "too different" to really join in the celebrations at the end. I don't think it helps that we haven't really seen him since to see how he changed (who the hell knows what was up with
Tri, he just gets pulled back into the Digital World and we never see him again), although there's a brief cameo in the 02 epilogue where Joe is treating him, probably more as an example for students than an actual injury.
The other seasons are the same. Virus is not all evil, and Vaccine is not always friendly. Guilmon is a virus Digimon, and he is a good Digimon. And yet, Vikaralamon is a vaccine type, but because she was a Deva, she was evil.
Pretty much, although each season had their own set of rules. Guilmon is only a good Digimon because Takato raised him, but he still has a Virus Digivolution tree all the way to Mega even when Takato had murderous thoughts. He was just more berserk at that stage. What makes the Guilmon stage a Virus is because of his powers, he's a
Digital Hazard Digimon that has the potential of messing with computer data when out-of-control. They otherwise can live peacefully, but they have to be handled differently than other Digimon or otherwise need to be left alone.
As for Vikaralamon, she was following orders as a Deva. They weren't necessarily evil as a result, they just had to do what their respected Sovereigns told them to do. Royal Knights are the same way regardless of their attribute.
EDIT: Oh, I almost forgot to mention for Wizardmon that the skulls that would show up on various Digimon designs are meant to act as a visual the Digimon are tricksters at their core regardless of attribute. That's why a Data Digimon has this villainous-look to him even though his actions were more anti-hero in nature.
