What character developments do you hope to see expanded in DLC?

Piggybacking on that ^

Scott trying to hit on Peebee and being told she's already taken by Sara, cue "that'll teach you to oversleep"

Suvie. Basically anything since her content was so limited.
Scott/Sara. The sibling. Would like them to come on a quest or two.

The Panthfinders. There all sort of just there. Would love a mission w/ all of them together.

Reyes Vidal repeat Reyes Vidal.

and If Bioware refuse to give Liam to Scott, They should expand Bro storyline between Scott&Liam. Some unique dialogue if Scott flirt him would be nice.

More our twin story and made him/her available in squadmate or at least have mission that they have to work together like the final battle.

One of my main criticisms of MEA is that the squadmates and Ryder are all a bit compartmentalized. DAI convinced me that the companions had relationships with each other (positive and negative), a relationship with the protagonist, and in some cases even opinions on the protagonist's relationships with other companions. There were flaws, but generally it mimicked real life.

In MEA I feel like Ryder has a relationship with their family. Then they have a relationship with their LI. Then they have individual relationships with their squadmates. Then some of the squadmates have relationships with some of the other squadmates. These relationships aren't really connected, and a lot of them are "hidden" in banter. To top it off, in DAI companions had unique responses in missions; if I took Solas and Cole to the Fade, they had completely different responses than Varric and Iron Bull. In MEA, there are two "roles" and the game just plugs whatever two squadmates you pick into those roles (with a few exceptions).

So, I really just want any DLC to work on weaving all these relationships together. I want my Ryder's twin to meet the squad, and interact. I want to see more conflict within the Tempest crew, and have more instances where I have to make a decision that is going to please one person and piss off another -- then I want them to react accordingly. Gil, Suvi, Lexi, and Kallo need much more development, too.

TLDR I want them to give more content to the existing Tempest crew & Ryder family before trying to bring in anyone else