Replying to your points slightly out of order:
I get that, and if I come across as hostile towards you it's because I'm very sarcastic, and sarcasm doesn't work well in text. So sorry if I come across as ruder than I intend. That said, the people I was replying to before you addressed me were definitely being very hostile to Corvi, and I don't think that's appropriate when he's coming forward to apologize. Now on to your main points:
I never got a malevolent vibe from him, and I know some other posters here feel the same way. As for the timeliness of my claim, my post history in the forum is publicly available. You can search for my posts at the time of 2.5 and see that I was saying much the same thing then. If you'd really like, I might even got bored and search for them myself.
Possibly. I freely admit that I only have Corvi's statement in the OP to go on here, as I don't really talk to any FR players, I don't think. And we're agreed that 2.0 Haurchefant was going toned down too far in EN, so I wouldn't be surprised if the other languages were less toned down. But the fact remains that they were toned down because their respective Loc teams were concerned about player reaction.
I don't think it's fair to place it all on the EN community. It'd be one thing if only the EN team toned down Haurchefant, or if it was done over objections of the other teams or something. But the three non-JP teams all got together and agreed (without approval, sadly) that he needed to be toned down. Unless you'd like to argue that the FR and DE teams are trying to cater to the NA market somehow?
Well, I meant "added in" as in "added to the game as a whole." That is, by the time the postmoogle quests and Thancred's disaster were coded, written, and translated, I think the Loc team had already realized their mistakes. I admit my earlier phrasing was unclear, though.
As for Thancred (and Longhaft) in general I think it generally comes down to the difference between things happening to NPCs versus to the PC. You're right that both these NPCs have reputations as a womanizer or a walking double entendre, but neither of them are really directed at the player character. I mean, most people laugh off Thancred's passes, but some people get upset at Longhaft's shtick. And the response to the Horse year Heavensturn event was...mixed. If their goal with the 2.0 quests was to minimize the people offended by Haurchefant's character, I can totally understand why they made the changes (again, went too far, though).
But...that's exactly my point. They chose not to use a trope because it's not something a NA audience would readily associate with heroes and allies. Unless you're saying that I was wrong when I said the trope didn't come up much outside of JP? If so, I'd say it depends how narrowly you define the trope. If the trope is just "lech/debauchee," then sure, it exists outside Japan. If it's supposed to be "ally who's a lech and hits on you hard," then I'm not so sure about its existence outside Japanese works. Granted, my overall knowledge of trope prevalence is far from extensive, so I'll concede the point about its prevalence; but the point about choosing not to use it still stands, I think.