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Rensa is a cyborg who was created for an emergency case when all Level 5 Espers would rebel Academy City, she would then suppress them by using their abilities or copying other Espers' abilities. "Rensa" is in fact only the cyborg body, but there are 40 individual people who were reduced to small parts of their brains who control Rensa in turns.
Appearance
Rensa wears nurse clothing, which takes people by surprise by not looking intimidating.
Personality
Rensa's personality is hard to truly determinate. Her personality depends on which "person" is taking control of Rensa at any given time. For example #28 was rather robotic in her mannerisms talking about the "targets" and the "objectives" while being rather submsersive. However #29 was much more aggressive in using Rensa.
Abilities
Rensa is a one of a kind cyborg that was designed specifically as a counter measure in case the Level 5 Espers would turn against Academy purpose. She is capable of copying the abilities of any Esper by using a flower-like device that protudes from her back with "knitting needle"-like device within the flower. These knitting needles would then proceed to calculate and imitate the values of different Esper powers allowing her to be capable of using the abilities of the #1 up to #6 and of any other Esper in a 200 meter radius from her. Rensa describes her ability as "altering the wiring of her body similar to pulling the strings of a puppet, therefore being able to reproduce the characteristics of multiple people and therefore switch between multiple abilities".
While incredibly powerful, her abilities have some limitations. For example she cannot use two copied abilities at the same time, therefore she can only use one ability at a time and must switch her patterns to copy another ability. Another limitation is that her knitting needles cannot copy powers that cannot be comprehended, for example Rensa is unable to copy the abilities of Sogiita Gunha because his powers have been not completelly understood. Furthermore when Rensa tried to copy the Imagine Breaker she was briefly successfuly on imitating its power, however when trying to comprehend its mysterious nature, Rensa's arm began to swell up, while suffering violent convulsions and a breakdown.
Also since her knitting needles construct an output with the values of a certain Esper, if said Esper dies, then Rensa loses the ability of the Esper in question permanently. Because of Rensa's complex mechanisms, her construction alone required a massive amount of assets from Academy City to build her, furthermore the costs of maintaining Rensa are also known to be large, which are the main reasons why Rensa cannot be mass-produced.