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When The Black Knight/Zelguis dies in Fire Emblem: Radiant Dawn, he mutters "...phiran, I will wait for you in the afterlife.." although this is intended as a dying man missing a syllable in his last breath, this becomes slightly narmy if one knows that a "phiran" is a type of cloak.
And then of course, there's the line "Now one of those two is truly...alone..." Danananananana! You got Alondite!
While we're still on that subject, here's three words: Ike's memory scene. The voice acting just COMPLETELY ruined the dramatic moment. For starters, Ike should sound like a kid, not a poor man's reenaction of Marty McFly.
Nearly every cutscene in Radiant Dawn had absolutely horrendous voice acting. It's a toss up as to whether the memory scenes involving Zelgius and Sephiran or the wooden dialogue between Ranulf and Skrimir are more painful to listen to. And an honorable mention for Tibarn.
"To WING, brothers! Keep UP with me if you CAN!!!"
The European dubbings got it better, though far from great. The acting was decent enough more often than not, but sometimes you had the same actor voicing two different characters IN THE SAME CUTSCENE. As example, Zelgius and Skrimir in the river battle cutscene in Spanish. WHAT THE HELL?!
"FOOOOOOOORM UUPPPP!! SURRROOOOOOOOUUUUUUNNNDDDD THEM AAALLLLL!!"
"DOOOOOON'T LET A SINGLE ONE EE-SCEEEEEEEEEP!!"
Pelleas: You're going to pay! You're going to - BLAAAARRGGH! Guys, Pelleas just threw up!
For an otherwise touching and wonderful friendship/shippingmoment, Soren's crying at the end of his and Ike's hidden conversation hit this HARD. It's incredibly hard not to laugh at the thought of Soren of all people sobbing "Uwaaaah...GWAAAAH!". It's even better if you try to make the crying sounds out loud. People do not cry like that.
In Fire Emblem: Blazing Sword, right before the start of the final battle, the Big Bad removes the turban that has been covering one of his eyes. It reveals a big unblinking scarred eye. Though it looks a bit silly, the mood of the scene allows the reveal to be dramatic. And then, the eyeball jiggles up and down like a googly doll-eye once in a while he speaks...
Another one involving the Big Bad is the right before The Reveal on Ninian. For some reason, Eliwood's sprite goes black and remained that way throughout the entire scene.
Also, the infamous "DASTARD" line. The word in itself is used correctly, but it's so antiquated that it leads people to think it's mispelled.
In Fire Emblem Awakening, whenever the Avatar dies (which is a Game Over), Chrom's screams of "OPEN YOUR EEEEYEEEEEES!" are... overblown, to say it politely.
Outside of the CG cutscenes Awakening shied away from full-voice acting, and instead just gave each character a dozen or so voice clips that are played when the character is fighting or speaking. In the wrong context some of these can be unintentionally hilarious, like Donnel shouting out his Critical Hit quote "GET READY!"... while proposing marriage to Sully.