You know... I was thinking... Do the new additions to Doom Eternal were intentional to create a better moveset for the Doom Slayer in Smash?
The next features are my own opinion:
1- Upgraded Thruster Boots: They got 2 charges. Pretty sure the double jump doesn't count, but it could be made in Smash to either:
A-Use a Double Jump and a Forward/Backward Thrust.
B-Sacrifice a Double Jump for two Forward/Backward Thrusts.
They got an excuse for him having recovery here, instead of just a Double Jump.
2- Extra lives: Pretty much stocks for Smash. Self-explanatory.
3- Flamethrower: DoT attack, maybe short range. Since Smash has no Armor system, it could be replaced by ammo drops instead, assuming Doom Slayer's gimmick is a weapon wheel, similar to Hero's Spell system, except no RNG selection for Doom Slayer as he can attack with the guns as long as he has the ammo. No ammo, no attack, therefore, Doom Slayer is defenseless until he changes to another gun.
4- Grenade: AoE attack, forward-only attack. Self-explanatory. Like Banjo's Egg Grenade.
5- Doom Slayer Grunts: Another excuse to have some voicelines for the Doom Slayer whenever damaged. Highest grunt intensity on elimination. One example of a high pain grunt is a Cacodemon Bite in that french trailer. You can actually hear Doom Slayer's ****ing screaming his lungs out from the bite.
(Reference:
https://youtu.be/mIHkRIRJArU?t=1467... Guy gets bit after hooking the Cacodemon)
6- The BFG10K: Since the Final Smash might require an animated one, this one could be used. YET another excuse for the Doom Slayer to have a good Final Smash, involving the biggest BFG ever in the series. It might go like this:
Doom Slayer might send a Syphon Grenade to the target/targets... Given how it looks like a trapping dome, the victims might be trapped... Doom Slayer goes inside a portal and goes directly to the panel control of the BFG10K, presses some buttons and instead of using an energy ball, he launches himself, just like in Doom Eternal... The animation would be much faster, and might take like say, 5-10 seconds? Maybe 12-15, if pushing it. Anyways, Doom Slayer strikes the targets, and might trigger a green AoE mist on impact, to those who weren't affected by the Final Smash... The mist being the remnant of the BFG blast... Low to Mid Damage.
7- Meat Hook Super Shotgun: Given that is the signature gun of the Doom Slayer, he might carry this one by default, unless ammo runs out. Could be used as long-range grab or recovery on ledges.
8- Crucible Sword: Possibly a response to the Chainsaw being too violent for Smash... Can be used effectively for Smash attacks.
And well, that's pretty much it... If I have any other ideas, or someone can speculate more, feel free to do so, and I can add it here with an opinion of my own
Yes, I can also wishful think, haha!
Edit: Added "Crucible Sword".