Metatron

The Angel of Charity. Metatron can't refuse a person in need, but she's not very smart and has bad eyesight, so often her ministrations make matters worse and cause her elder sister, Sandalphon, to worry about her. Metatron's personality becomes sadistic when she's holding a syringe, and she gets an overpowering desire to perform extreme treatments.

(Source: Tokyo Zerostar)