OK let me see if there's something I could respond:
he literally put himself on house arrest for centuries, never bothered a single innocent soul. in fact he wanted humans to be like him, to be THEIR OWN gods. which is why he never vampirized Hector & Isaac, his training put them on a power tier that rivaled Death.
OK so, Dracula wasn't SUCH a good guy.
About him not pestering humans: Dracula was most likely laying low to avoid persecution. IGA has gone on record saying Dracula was studying the dark arts during this time, and such power was accumulated over the years previous to CVIII. One official timeline (albeit a bit dubious given specific inconsistencies), claims that Dracula's power rose with every vampire slain by the Belmonts -- which does imply Dracula was actually taking intentional profit from their vampire-hunting activities
About the Forgemasters: He offered a home due to them having born with special abilities. Hector, in special, could make contact with the animals of the night, who guided him to Dracula's Castle at an young age after they presumably killed his parents. Although I believe Dracula brought them under his wing due to them being shunned by humans, the fact that only THEY BOTH can serve as Dracula vessels on such a convoluted system (Be infused by Dracula's magic + succumb to Dracula's Curse) could be an implication that he did in fact plan them to be his backup bodies.
Also, bear in mind the following: Hector, on CoD, during his confrontation with Dracula says
"When you started slaughtering humans indiscriminately I had no choice but to disobey you!" So, Dracula was in fact using humans "discriminately" somehow. The way Hector says it implies that Dracula was probably using corrupt people to do his experiments or -- maybe -- feed upon. But a slaughter is still a slaughter.
its anyones guess on what his plans for Lisa were had she not been executed, but i can prolly say he had no intentions on vampirizing her either.
And I follow behind this. The manuals say Lisa was like Virgin Mary and helped Dracula "regain his human heart". I'm pretty sure Dracula was ALL about protecting her humanity and purity.
he didnt even want beef with House Belmont; he offered Leo a seat at his table & when he refused, he was like "fine whatever" & left him be.
Well........ he did order Death to kill Leon, man. It was more like "either you sit at my table, or you gonna sit on a coffin". He
absolutelly despises anything perceived as betrayal.
or would he have still went berserk no matter how she died?
Were not Lisa, something else was going to be the last straw. I say this because Dracula was THAT close to turning into the Devil. The slightest slight towards him that could be seen as injustice would turn him evil. There is another element here: Death. Judgment's ending implies that Death IS following a greater will: Chaos itself. And Chaos yearns for a Dark Lord.
I'll concede it's not possible to say for certain. But the variables pushing Dracula to become evil incarnate are too many.