Awesome, yeah I'd say make the game you want first. So if you personally like anal then go for it, not necessarily because some rando mentions it.
That said I was actually talking about anal *ahem* the other way around. Like I said, I'm a bit of a degenerate
Ryona seems to be some kind of fetish revolving around seeing women get beaten up. Kinda off-putting and not really my thing but, whatever. As long as it stays within the realm of fantasy then it is what it is. So when they said "Reverse-Ryona" I guess they meant female characters beating up/dominating men.
Guro is way more hardcore and involves disembowelment, amputation, blood, straight up murder etc. Frankly I'm not usually one to judge fetishes but I think it's fucked up and want to be nowhere near it.