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There are quite a few party members inXenoblade Chronicles X: Definitive Edition. Many more than any of the rest of the series, and more than plenty of other RPGs as well. It’s a pretty large cast, with each of them having their own stories to tell. Unlocking most of them is typically pretty easy too, finishing their respective Affinity Missions to add them to your party.
Of course, Mia has to be an oddity. From when you first meet her back in NLA to a full-fledged adventurer, she doesn’t make it easy to add her as a companion. The wait is worth it though, as she is also one of the strongest members of the whole party in the game.

How To Recruit Mia
For the vast majority of party members in the game, you unlock them either by progressing through the story, or by completing their Affinity Missions, which are typically marked on the map and found in NLA.Mia instead requires completing a whole host of Normal Missions(those are the green ones) which span across the length of the entire game.
There are five missions in totalyou must complete before unlocking Mia as a companion. Here is each of them and when they unlock:

As you might expect,each previous Mia mission must be completed before the successive one becomes available.
After you finally complete all of these missions, Mia will join your party.She also has an Affinity Mission of her own, though this only become available after she has already joined your party.

Completing Each Of Mia’s Quests
None of Mia’s individual missions are too complicated,it’s more the act of finding them that is difficult. Here is each of them, and where they’re located.
Mamma Mia!
This one is found in NLA,not far from the elevator that leads to the Hangarbeneath the Administrative District. Chat with Mia to learn that she is desperately yearning for adventure, and enlists your help in getting her beyond the walls.
To complete this mission, all you have to do isbuy her some Iron Blades and Combat Bodywearfrom the nearby store in Armory Alley. Make sure it’s the exact ones she asked for, and she won’t accept anything else. With her new weapons in hand, she sets off on a brand new adventure.
Adventure!
This mission is found in Noctilumnear the top of the canopy of the Skybound Coil Tree. She lost her comm device, and needs your help to find. It’s not located far from here, and can be found easily by checking the map. It isguarded by a level 41 Tyrant, but you can walk right under them if you do so slowly. You could also use Shadowrunner for a bit more safety.
After bring back her comm device, she finds herself in another spot of danger, getting trapped atop a Wood Tectinsula.Defeat this dangerous indigen for Mia’s profuse thanksand not a single reward. To Oblivia she heads next.
Mighty Mia
Next, Mia finds herself atop the massive Leaning Ring of Oblivia. This time she is beingharassed by a Falconine Auravisand can’t escape, and you again come to her resucue.
After dispatching the winged beast, she again thanks you, andmakes a quick escape before you can ask for a reward. Surely she’ll have that reward next time.
It’s-a Mia!
Mia has finally got her hands on her very own Skell, what she was looking for when she first wanted to leave NLA. And of course, she’s managed to break it. You must gather uptwo New Cylinders, which you’re able to get from Guardian Pugiliths in Sylvalum, andfive pieces of Missile Wiring, which can be easily located on the map.
With these returned and her Skell repaired, you are suddenly attacked by apair of Buoyant Pugiliths. Defeat these monstrous machines for even more thanks from Mia. While she is rich in gratitude, she is a pauper when it comes to a monetary reward. And off to Cauldros she flies.
Mia Is Missing
Somehow, Mia has managed to get herself captured by the Ganglion, and istrapped inside the Ganglion Antropolis in Cauldros. After you find the area in which Mia is locked away, she’ll ask you to defeat her jailer and retrieve the key.
Deeper within the Antropolis you will find a Definian enemy, anddefeating them will give you the key to Mia’s cell. Head on back to NLA with Mia to finally get the reward she promised you all that time ago - her presence in your party. It’s not money, but it’s something for all that effort. She also gives you theFILE-USP0880SA, used to make one of the Skell Superweapons. So that’s something extra for all the work.
Mia As A Companion
Once you finally have Mia added to your party, you will have had a good chunk of the game completed, so it’s good then that she has so many helpful abilities to make her useful in the later content of the game.She comes as a typical Psycorruptor, with two unique Signature Arts for the Raygun. These are:
Mia is a great companion for all thedebuffs she can dish out to enemies, but also for the buffs she can provide to the party. She’s no slouch when it comes to dishing out damage either, though support is where she excels. Many of her skills, such as Extra Armor, make her even more sturdy for those tougher battles. She’s all around dependable, ironically enough.