It's time for the second TV Tropes Halloween Avatar Contest, theme: cute monsters! Details and voting
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Hey, It's That Voice! - Fiona Jarnefeldt is voiced by Maaya Sakamoto, who also voiced Sumika Juutilainen all the way back in Project Phantasma. In English, she's voiced by Kari Wahlgren, best known to gamers as Princess Ashe.
And Serene Haze is voiced by none other than Major Kusanagi. Really, that low-pitched voice should have been a giveaway.
And of course, way back before she became Nanoha, Yukari Tamura was the "Standard"-type Computer voice in the first Armored Core trilogy, as well as being the occasional operator voice for the drop ship you are using.
Armored Core V is loaded with this with voice actors like Tara Strong, Grey DeLisle, Laura Bailey, Roger Craig Smith, Grant George, Troy Baker and Nolan North being a few.
Nolan North also showed up in Armored Core 4, as an enemy Lynx. Doubles as Retroactive Recognition - Uncharted came out a few months later.
Tsuyoshi Koyama AKA Bang Shishigami as Old King. Er... wut?
Keiji Fujiwara ( Ali al-Saachez) voices the nigh-psychotic AI villain Chief in the Japanese version.
On the US side the Red Tallest is Chief; things make a little more sense now.
Steve Blum is Otsdarva, Thermidor and Shinkai.