I'm not familiar with Stratos 4, but that looks like Pyoro from Vandread. It seems that the voice actor for Honjou Mikaze (Kakazu Yumi) also voiced Dita Liebely from Vandread. Pyoro's Voice actor, Iwata Mitsuo, voiced Kouichirou Sako from Stratos 4. Both series were also directed by Takeshi Mori and seem to be anime original, so I'm adding the creator_connection tag.