Height/Build: 5'10" and growing. A little gangly but growing into it. Arms more defined than legs because he uses a stupid weapon and climbs a lot.
Physical Mannerisms: Slouchy, but can sit or stand military straight if sufficiently intimidated needed. Sprawls sitting down. Talks with his hands, fiddles if he's holding something, and/or paces when excited. Rubs the back of his neck, checks his surroundings, or pulls out a sketchbook from his pocket and starts drawing when idle.

Verbal tics: General American accent, talks faster when excited.
Voice: Deepening and mellowing from this to this.

Clothing Style: Casual. Largely jeans and long sleeved shirts (some raglan, some henley) with the sleeves rolled around his elbows. Wears a silver ring on a leather string, this device and a PacDisc on a lanyard, and a nice silver watch on his belt loop, and very frequently a gunblade holster on his belt.

Tattoos/Piercings/Scars/Metal limbs/etc: None.

Anything else: There's no image above because Nate's at a college freshman age between pretty physically different canon points/ages, looking older and better fed than the first edit below (and his icons) but younger than the second:

Nathan "Nate" Drake

Cadet ID #20715: Covert Operations
Sponsored by Carbuncle
Lives in dorm A101
Born on August 24th 1977 (age 16)

Scan data:

Nathan Drake · 16 · male

Mainly fights with a gunblade, but versatile with weaponry. Prefers fighting evasively. Likes food, but dislikes relying on other people.
High evasion and luck; low magic and spirit. Weak against Poison.

App, witchesreign tag, concoursec tag

Upon finding himself in Balamb instead of Cartagena, Nate was both relieved that there was no longer anyone shooting at him, and a little disgruntled by having to learn to adapt to a new place without warning. He blended in with some success until he was caught stealing food. The Balamb town council, trying to punish him, realized no one in town knew him, and Nate didn't know enough about the world for his story about being a tourist to hold up, so the council deduced that he was an off-worlder. Without a guardian around, Nate was sent to the recently returned Balamb Garden so that someone would take responsibility for him, with the proviso that he still complete his community service for the theft.

( Current class schedule )

( Old class schedules )

Limit Break:
Nate's Limit Break is his Super Moves from PlayStation All-Stars: Battle Royale (which probably isn't part of his canonical history and if it is, is way past this canon point):

Crisis level 1: Nate summons a propane tank from nowhere, throws it, and shoots it (did he not have a gun before? he has one now). BOOM.

Crisis level 2 and 3 (I'm merging the middle two levels because PSASBR had three levels of Super Moves; also his level 3 Super is overpowered): Nate summons a huge stone pillar from nowhere and pushes it over on top of whoever's in the way.

Crisis level 4: Nate summons the El Dorado sarcophagus from nowhere (are we sensing the theme of PSASBR), which releases a virus that afflicts the enemy party with the Zombie status and does significant physical damage to them. (This is an VIII-verse adaptation of what in PSASBR turns everyone into zombies which can then be one shotted. See what I mean about overpowered?)
All these summoned objects disappear within a few moments.

( WR specific headcanon )