O Troi tem um sotaque tipicamente betazóide?

O sotaque de Troi é tipicamente Betazed , pelo menos de acordo com a atriz que interpreta Deanna Troi, Marina Sirtis;

They said "OK, you've got the job. You have to do an accent". And I said "Well, where do you want the accent to come from? and they said "Betazed" [audience laughs] So I though "Great! I can make up an accent. I mean, who's going to tell me that I'm doing it wrong? Hands up all the Betazoids in the audience..." [Marina is the only one who raises her hand. Audience laughs again] ...so I made up this accent".

Por que o sotaque dela é bem diferente do sotaque de sua mãe, a produtora do programa originalmente explicou seu sotaque era semelhante à do pai dela. Após TNG: Dark Page foi produzido (em que aparece seu pai com sotaque americano), Rick Berman, em seguida, explicou a ela que era porque ela tinha sido mandada para o internato.

Now I assumed that I was doing the Betazoid accent. But then mum came along. Well obviously she was from the American sector on Betazed [Audience laughs]... because she didn't have an accent. She had an American accent. So being, as I said, one to make trouble I go to Rick Berman's office and I knock on his door and say "excuse me, I thought I was doing the Betazoid accent but obviously I'm not because Majel is American" and of course by this time we're well into the filming and they're rewriting scripts constantly. They're really busy. They're casting, they're editing, they're doing all this stuff and the last thing they want is Marina Sirtis knocking on their door and being a pain in the butt. So Rick Berman, and I know all he wants to say to me is "shut up and get out of my office", but he has to come up with an answer so he says, "you know what, it was your father's accent". And I said "Really? Because I don't believe that because of my relationship, Deanna's relationship with Lwaxana was kind of identical to my own relationship with my mother, God rest her soul. And I knew that they had lived together in the same house. That was why there was so much friction on the show". So he was like "No, it's your father's accent and go away".

Well then I think it was Season 6 or Season 7, I don't remember because they've all kind of blended together at this point, Dark Page, where we met my dad [she pauses for effect] who was from Iowa [audience laughs]. And I just had to. I know we were coming to the end of the series and I had to go back to Rick Berman's office and ask. So I knocked on his door and I said "You told me back in season 1 that I was doing my father's accent but actually we've met dad now and he doesn't have an accent" and Rick is ready to throttle me. He's like "Really, this is the conversation that we're having now?" And he goes "They sent you away to school! Now shut up and get the hell out of my office!!

O sotaque de Troi é não tipicamente Betazóide baseado em evidências. Outros Betazoids , notavelmente Lwaxana Troi, Devinoni Ral, Tam Elbrun e Lon Suder, não.

Nunca há qualquer explicação dada para a origem de seu sotaque no universo. Como você apontou, a mãe de Deanna, Lwaxana não fala com tal e sotaque. Além disso, nem o pai dela, Ian Andrew Troi, representou em "Dark Page" por volta das 25:00.

O ponto principal é que não há explicação no universo.

Fora do universo foi abordado na questão ligada, mas com relação ao fora-universo fora do universo, presume-se que no momento em que Sirtis e os produtores decidiram que ela usasse o sotaque que ela faz, o mentalidade teria sido que era como Betazoids falar. Mais tarde, quando Lwaxana foi adicionado, foi decidido que Majel Barrett não podia ou não queria tocar o mesmo sotaque. Daí em diante, nenhum outro Betazoid jogou o sotaque também. E a última explicação do holdout teria sido o pai dela. Mas quando ele foi retratado em "Dark Page", foi decidido novamente (se era mesmo considerado) não tocar o sotaque. Isso teria sido uma justificação estranha de qualquer forma, já que ele é humano. (Claro que todo este parágrafo é mera especulação.)