The nature of your patron, in a roleplay sense, such as at a game table, has a massive impact on what sort of a warlock you are. The goals and drives of your patron are a broad-as-can-be spectrum of possibilities, based no what sort of patron they are.
Even at the level of just the fiend pact; a devil patron is likely to have complex, over-arching plans with many intricate aspects to them; they'll generally want warlocks who can work within that, but exactly what sort of plans they have, and how far-reaching they are, will vary as well. Devil pact patrons are the kind that might surreptitiously cultivate an on-going bloodline of their warlocks for inscrutable ends. They're more likely to play politics with mortals and manipulate existing structures. On the flip side, demon pact patrons tend generally to be more straight forward and blunter in their drives. They trend towards chaos and causing as much of it as they can, and in many cases, once they drive their warlock to their own destruction they'll just find another one. Even these are just broad generalities.
Unfortunately, If what we've seen so far is anything to go by, I would not hold your breath for any depth of attention on this score. Expect, at best, to have the fiend pact painted in one specific way universally, with no further player input, the old one another, and any other pacts they manage to give us doing the same.
