I'd be super hyped for Sami.
And while I've not read through the six and a half pages to know if it's been mentioned or not, [Edit: I agree] she'd be a super reasonable successor to most of Snake's moveset, maybe with some Mii Gunner-like options instead of Cipher or the land mines.
Edit: more elaboration below
Heavy end of midweight. She's thin and in shape, but carries at least a machine gun if not a rocket launcher in her artwork (rocket launcher in AW1 and 2 cover art, machine guns in her in-game sprites). Fast walk, not so fast run due to the gear, despite her infantry specialty and training.
Her stage entrance could be jumping/climbing out of a T-copter (Captain Falcon/Fox-like?). Alternately, riding in on a Bike (based on the unit from Days of Ruin despite her not appearing there. Hey, Robin can use Nosferatu as a Tactician).
For specials, I'm imagining something like this:
Neutral: Mech Bazooka
- Mech Bazooka could be a charge-variant explosive similar to Peanut Popgun crossed with the remote missile. Could include similar backfire capability, and have the rocket fizzle out at a distance based on the charge, perhaps including a sweetspot charge time right before the backfire. Aimable +/- 45 degrees while charging, giving it edgeguard potential even against enemies recovering low.
Side: Grenade
- Pull and throw, like a quick Link bomb that explodes after a set time. Similar to Snake's without variable throw angles or the ability to cook the grenade.
Up: Rocket Jump
- Like Palutena's but with different properties/sweetspots. Perhaps like an explosive, but not as aimable, version of Gunner's Lunar Launch.
Down: Capturing Stomp
- That jump infantry units use when capturing buildings and whatnot in Advance Wars? Imagine it here and working similar to Greninja's dair. Bounces off of shields dealing pretty big shield damage, but only some low damage and a weak meteor otherwise.
Final Smash: Victory March. A temporary movement speed and jump height boost that gives her armor and grab immunity, and makes Capturing Stomp deal tremendous (or OHKO levels of) damage with negligible endlag. Or, a quick dash forward that catches the enemy in either a cutscene or other similar animation involving the capture stomp.