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Elasti-Girl (also known as Rita by her teammates) is a member of the Doom Patrol, the quirky superhero team that took Beast Boy into their ranks before he joined up with the Titans. Elasti-Girl is able to grow to incredible size to gain the upper hand in battle.
Not very much is known about her past.
Elasti-Girl served as a mother figure role to Beast Boy when he was still a Doom Patrol member, and is usually the first to show disagreement with how Mento treats him. She seems to be the only one Mento regards higher than his own duties as leader and superhero, and a heavily implied romantic interest is between the two. Elasti-Girl shows to be like Starfire by always showing compassion and consideration for others, and they're the girls of their own team that always have a big heart.
When Beast Boy was still in the Doom Patrol she often got him out of trouble whenever he messed up a mission. She acted like a mother to Beast Boy and even knows his real name. She once told a story on Beast Boy's birthday about how she read to him at night and would kiss him good night as well. Since she and Mento did not have any children she treated Beast Boy as her own even though they are not related by blood.
- The name "Elasti-Girl" is also the alias used by Helen Parr, from the Disney Pixar movie "The Incredibles." Helen's super power, however, is stretching, more akin to Madame Rouge's powers than the Doom Patrol's Elasti-Girl.