H7-09, also known as Aychseven, functioned as a droid within the ranks of the Nihil marauder group. This droid was part of Lourna Dee's Tempest, specifically the Tempest Runner, and fulfilled its duties on her personal starship, named the Lourna Dee.
The voice of H7-09 was provided by Vikas Adam for the audio drama The High Republic: Tempest Runner, which was penned by Cavan Scott and made available on August 31, 2021. His initial mention occurred in the cast announcement article for the audio drama, found on StarWars.com on July 28, 2021.