Eko is a female student who Takechiyo bumps into one day while running in the hallway. According to him, she's supposedly known as an ace athlete helping out in the athletic clubs. She claims to be a normal person similar to the way Yuuka did. She is usually seen with her long hair tied up in twintails like Yuuka sometimes does with her hair.
Powers and Stats
Name: Eko Yonekura, Heidimarie Heidegger (in a previous life)
Classification: Robot, Human (in a previous life)
Attack Potency: Wall level (Can destroy walls by her bare hands)
Speed: Possibly Supersonic (Is able to run on walls)
Lifting Strength: Unknown
Striking Strength: Wall Class
Durability: Wall level (Similar robots can survive after falling from 100-meters height)
Range: Tens of meters
Standard Equipment: None
Intelligence: Very high, combat genius
Heidimarie is an experienced soldier who has lived long enough in the war, where infantry is only cannon fodder, the meaning of which in covering mobile suits. Even by the standards of her world she is incredibly talented. Enrolling in a green rookie squad, which is know nothing but the factory floors (where children work, because all the adults are at war), she learned to manage with any weapon for a few weeks. And her skills increased so much that she became able to cope with a mobile armor alone (that was considered absolutely impossible).
Even after the rebirth as a robot she has not lost her skills. Now Eko is able to run on the walls, like on the ground, and her punches is able to punch a wall.
But only fighting skills are not limited to its ability. She is very intelligent and well versed in the technics (and level of technological development in her world is much higher than in the experimental world, which is roughly equal to ours).