Ekaterina II S

Ekaterina II S is a large general purpose transforming robot manufactured by Kongou Airlines in Academy City. It is named after Kongou Mitsuko's pet python Ekaterina.

Principles
Initially looking like a large utility truck, it can transform into a large Powered Suit, similar to that of Multi Active Rescue's Gigantic Advanced Movement Armor. Like it, it has wheels upon its feet to roll on a flat surface and has been shown to be very quick. It also has clamps for grabbing things, as well as a pile bunker. It's arms and legs can be disconnected from the torso.

It requires two people to pilot, and is apparently easy enough for two middle-schoolers, like Uiharu Kazari and Saten Ruiko, to pilot in combat without experience and only a single night of studying its manual. It is they that used the mecha to defeat at two large Powered Suits owned by STUDY, during the Silent Party.