I love making movesets, so how about a moveset for my most wanted!
I tend to skip to the specials myself, so let's start with those
Neutral B: Siphon grenade. Quite simple, Doomguy tosses siphon grenades around, much like Snake. Unlike Snake, these grenades have zero knockback, instead they provide a small amount of healing for Doomguy as they damage his opponents.
Side B: Meat hook. Doomguy fires the grappling hook on his super shotgun. Doesn't bypass shields. If it hits the enemy will be momentarily stunned as Doomguy reels himself in. Pressing B while mid flight will fire the super shotgun, fire it when you're up close for the greatest damage and knockback! Provides tether recovery.
Up B: Rocket jump. Super simple, and basically what everyone else is putting as his up B. I'm not going to add a timing element here however, Doomguy will simple fire a rocket below him and immediately fire, rocketing himself into the air. The explosion can spike enemies, and will damage Doomguy a small amount.
Down B: Power-up. This is where I feel my moveset gets fun. Think Shulk monado arts, though Doomguy will only get four powerups. Berserk, Haste, Invulnerability, and Damage. Each powerup would also cause Doomguy to glow in a seperate colour, red for berserk, yellow for haste, green for invulnerability, and purple for damage.
Haste is a speed buff. Select this powerup and Doomguy will be flying across the stage, as well as becoming lighter. This makes him harder to combo, but much easier to outright KO, if you can hit him. Invulnerability won't provide actual invulnerability. Instead you take less damage and knockback. Balanced out by dealing less damage. Damage (renamed because dealing quad damage would be way too powerful) will do as it says, you deal more damage. Unfortunately you take more damage too.
Berserk will act quite faithfully to the games, completely changing Doomguys moveset, replacing EVERYTHING with a one-two punch. This one-two punch will have immense knockback and shield damage, and will have super armour. It also completely neuters his range, and he can't use specials while berserk, so get him off stage and he's as good as dead.
Now for his A attacks!
Jab: Think Mega Man here, except instead of pellets we get a plasma rifle. Hold A to continue firing forward while moving.
F-Tilt: Same as jab. Smacks the enemy with the butt of his plasma rifle.
D-Tilt: Heat blast. This move gets more powerful the more you use his Jab / nair. A solid get off me tool, with KO potential when charged at higher percentages, and combo potential at low charge. The blast will come out slightly lower than in his game.
U-Tilt: Stun bomb. Doomguy fires a stun bomb directly above him, it detonates immediately. Stuns and damages opponents above him, allowing for a follow-up.
Dash attack: I'm thinking shoulder tackle right now, but I'd love to see this as an opportunity to get another armblade punch into his moveset. Thoughts?
F-Smash: A good 'ole one-two punch, with an added dash forward and a touch of super armour.
D-Smash: Here comes the super shotgun! Doomguy fires it into the ground in front of him, before firing the second shot behind him. Closer the enemy is, the more damage they take.
U-Smash: Gauss rifle (or the equivalent from eternal). Similar to Palutenas U-Smash visually, Doomguy charges the rifle and fires it straight up.
Nair: Plasma rifle. Hold A to continue firing as you move through the air.
Fair: A downwards punch using Doomguys armblade. Has a tipper, which spikes. Think Mario fair.
Bair: Doomguy twists around and punches behind himself, armblade again extended. Good kill move, particularly on the tipper.
Dair: Death from above baby! This is a downward stomp, reminiscent of glory kills from above. Spikes. Think Ganondorf dair. Alternatively, could be super shotgun aimed down.
Uair: Super shotgun, directly above him. Sweetspot close to the barrels.
Grabs. These definitely need to emulate his glory kills, though they won't be as violent. This is a sporting event after all, we're not trying to kill here!
Pummel: Gut punch. I'm envisioning the armblade being used here, I mean come on, it'd be no more violent than Ridley! Otherwise / regardless, Doomguy punches his enemy in the gut.
Forward Throw: Kicks out his opponents leg and let's loose with a hook, smashing his opponent forward.
Back Throw: Doomguy punches his opponent behind him, before following up with a kick, sending them flying backwards.
Up Throw: Punch your opponent down, then follow up with an uppercut to send them flying into the air.
Down Thrown: Doomguy let's go of his opponent, raises both arms above his head, and smashes his enemy into the ground. This is a bury.
Final Smash, how could I have forgotten?
BFG. Let's go Doom 2016 version. The main blast is where most of the damage and knockback is, but even if it misses an opponent they'll get caught by energy tendrils, which will paralyze as they damage, inflicting similar amounts of damage as the main blast, but not nearly as much knockback.
Or we could go BFG 9000, with the shot targeting the screen much like Giga Bowser, Pit's chariot, or ZSS energy beam.