Warlocks in DnD are practically screaming for a Lovecraft style treatment. Master the Dungeon discusses some ideas for Lovecraftian warlocks in D&D.
"The Snow Weaver, while appearing to be an exuberant young child, is perhaps one of the more dangerous patrons to deal with. They are entirely unconcerned with the consequences of their pathological frivolity and their ignorance of the gravity of mortal death can be problematic."
With a thirst for knowledge and power, a Warlock submits themselves to a supernatural being with greater capabilities than their own, unlocking life-altering magic and arcane secrets. Flutes Loot goes over the lore of many different canon patron options, and potential motivations for their warlocks to enter a pact with them.