https://www.pixiv.net/en/artworks/142153663 Echo Ein (エーコ・アイン), also known as Bobchi (formerly known as Bob Hair Girl), and who goes now by her magical girl name: Brilliant ☆ Echo from Alter.2, the 86: Eighty-Six Magical Girl spin-off, accompanied by her Eighty-Six; which are Ochi Anton (オーチ・アントン), Io Dodanthe (イオ・ドーダンセー) and Shuri Gilith (シュリ・ジリス), Echo Ein first made her apperance int he anime of 86: Eighty-Six (86-エイティシックス ヤンデレ). as a nameless character, due to that she was often refered by people as Bob Hair Girl or Bobchi for short. So her name came as a surprise, as it was revealed in the Magical Girl Regina ☆ Lena is a spin-off series in Alter. 2.
Bobchi now known as Echo Ein was once an anime-only character and one of Vladilena Milize's aides in the military when she was demoted to captain in the regular 86 anime. In Alter 2, she's a magical girl.
What is known about her is that she follows Lena like a puppy, but that she was a soldier who still maintained the innocence of a normal girl.
This art was uploaded to celebrate the English release of Alter 2 which is part of the of the "86 -Eighty Six- Magical Girl Regina ☆ Lena ~Fight! Galactic Navigating Battleship San Magnolia" (「８６―エイティシックス― 魔法少女レジーナ☆レーナ ～戦え！銀河航行戦艦サンマグノリア～」