1. Street Fighter was on every console it could have been. It's an arcade series originally (I don't think SFV has cabinets made for it though).
2. Castlevania started as a NES franchise
3. Final Fantasy started as a NES franchise
4. Cloud represents FFVII and no other Final Fantasy, not the series itself. FFVII is a Playstation game. He's not about the six games that appeared on Nintendo consoles, he's all about FFVII on the PS. No other console, no other game, just the one. His global appeal got him in, not what the first six of Final Fantasy did on Nintendo.