Need help with concept for warlock

[Richard Brookes]

so the concept is that my warlocks parton is their dead twin brother who died and birth and that they have be bonded since they my character was born and i'm having trouble find what subclass works

 

[Blue]

so the concept is that my warlocks parton is their dead twin brother who died and birth and that they have be bonded since they my character was born and i'm having trouble find what subclass works

The Patrons all come from points where they have power and agenda. Determine why your dead brother had power, and what his agenda is, and some may leap out at you.

If the source of your twin's power is his unnatural death (or alternately he gave his life so you could live), then The Undying from SCAG might be a fit. If you are allowed the UA subclasses, then The Raven Queen might also fit this niche, including keeping your brother's spirit in a raven.

If it's NOT really your dead brother, just something pretending to be him to get it's hooks into you, Fiendish (and Great Old One) could work well.