Well, I've already expressed some thoughts earlier.
Personally, I think the first mun with the character should give consent. I mean, there are some cases that are totally AU that I don't think it'd be necessary (for example, in Patalliro Saiyuki it's a different universe, and Maraich isn't even named Maraich. He's a monk instead of an assassin, he even says killing is wrong... So I don't think in that case someone would need permission. Since I use orange-hair/blue eyed Maraich, they wouldn't even look exactly the same). Although I wouldn't expect the mods to know all the info offhand, especially not for every series, but they can ask if they need to.
On the other hand there are series that basically rehash the same story, and the characters are supposed to be basically the same. I'll just use another sample from my own series. I play manga!Maraich. He's basically the same as anime!Maraich, although they change a couple things. But in that case, it would be very close to the character I'm already playing, so I probably wouldn't want someone to app anime!Maraich (especially since I incorporate a couple things from the anime. Much like a lot of people do with their characters). I think in that case it should probably be discussed with whoever had the character first.
And then there's the third scenario, like we discusses about Phoenix, which probably happens the least often. That's where it is the same character, but in a different part of the timeline that's far away from the timeline the original mun is playing from. I think consent would be important there, too, but the option should be open because sometimes it's almost like a different character.
Overall, I think it's important that: The characters be reasonably different. The person who had the character first is ok with it. And, in the last case, it would also be important that there's a decent time lapse between character A and character A2. If it's something like 6 months... Well, it's completely likely that the first character would be on DDD for six months and get to that part of the timeline. With something like 5 years it's easier to make it that the timeline never overlaps like that without stretching it out so much.
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Personally, I think the first mun with the character should give consent. I mean, there are some cases that are totally AU that I don't think it'd be necessary (for example, in Patalliro Saiyuki it's a different universe, and Maraich isn't even named Maraich. He's a monk instead of an assassin, he even says killing is wrong... So I don't think in that case someone would need permission. Since I use orange-hair/blue eyed Maraich, they wouldn't even look exactly the same). Although I wouldn't expect the mods to know all the info offhand, especially not for every series, but they can ask if they need to.
On the other hand there are series that basically rehash the same story, and the characters are supposed to be basically the same. I'll just use another sample from my own series. I play manga!Maraich. He's basically the same as anime!Maraich, although they change a couple things. But in that case, it would be very close to the character I'm already playing, so I probably wouldn't want someone to app anime!Maraich (especially since I incorporate a couple things from the anime. Much like a lot of people do with their characters).
I think in that case it should probably be discussed with whoever had the character first.
And then there's the third scenario, like we discusses about Phoenix, which probably happens the least often. That's where it is the same character, but in a different part of the timeline that's far away from the timeline the original mun is playing from. I think consent would be important there, too, but the option should be open because sometimes it's almost like a different character.
Overall, I think it's important that: The characters be reasonably different. The person who had the character first is ok with it.
And, in the last case, it would also be important that there's a decent time lapse between character A and character A2. If it's something like 6 months... Well, it's completely likely that the first character would be on DDD for six months and get to that part of the timeline. With something like 5 years it's easier to make it that the timeline never overlaps like that without stretching it out so much.