- Thompson Sisters (トンプソン姉妹Tonpuson Shimai?)
- Liz: Voiced by: Yūko Kaida (drama CD), Akeno Watanabe (Japanese), Jamie Marchi (English)
- Patty: Voiced by: Miyuki Sawashiro (drama CD), Narumi Takahira (Japanese), Cherami Leigh (English)
- Twin demon guns and the weapon partners of Death the Kid. They both take the form of semi-automatic pistols (which are similar in appearance to the Beretta 92 Inox, IMI Desert Eagle or Jericho 941) that compress Kid's soul wavelength and fire it in the form of energy bullets that range in strength from destructive blasts to painful yet non-wound-inducing shots. Elizabeth "Liz" Thompson (エリザベス(リズ)・トンプソンErizabesu (Rizu) Tonpuson?), the older sister, is a cynical young woman who always finds Kid's perfectionist attitude annoying, but is also very cowardly and easy to frighten. She finds it very upsetting that Patty, being the younger sister, has a bigger bust than her own. Patricia "Patty" Thompson(パトリシア(パティー)･トンプソンPatorishia (Patī) Tonpuson?), the younger sister, is an extremely childish girl who is able to maintain a cheerful attitude in any situation, but usually has bouts of psychotic rage to motivate her partners. Each sister is able to wield the other in their weapon form to use whenever Kid is unable to. Liz and Patty were abandoned on the streets of Brooklyn where they mugged passers by to survive. The sisters attempted to mug Kid upon first meeting him, but instead decided to join him with the intention of exploiting his wealth and authority as a Death God. However, they grew closer to Kid over time and they gradually outgrew their greedy desires.
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