Not much besides her appearance was discussed previously so here goes:
Nationality: German. Evidenced by her codename, which is german for "thunderstorm".
Personality: She's very rough-and-tumble / tomboyish in her interactions with Raiden. She can be pretty surly when talking to anyone else. She loves the adrenaline rush she gets while fighting, leading to the wide-eyed expression depicted above.
Place in the game: Intended to take the place of the Mistral and Monsoon body-double fight in World Marshal (before the Sundowner fight).
Cyborg body: Her body (namely her torso, forearms and calves) is hydraulic based, with the aforementioned parts being the pistons. There are rotating joints that allow for more freedom of movement in her elbows, wrists, knees and ankles. The Desperado logo is visible on her left thigh. Her visor works sort of like Sundowner's shields; however, they are designed to lock together better with their slanted design. They also lack any explosive properties.
Fighting style: Gewitter fights both hand-to-hand and with a weapon. Her hand-to-hand style of combat uses her hydraulics to the best of her ability-- she can duck overhead swings by compressing her torso, and can deliver strong point-blank punches or kicks by shooting a piston extremity out with extreme force at a target.
Weapon: A HF club-like weapon that can split into a segmented, whip-like weapon. It's roughly two times the length of a baseball bat when extended. It can be used one-handed, but the handle allows for a two-handed approach.
Thoughts? Comments? Criticisms?