OK, guys. Where do we start? And BTW, not ALL the powerups, just the stuff from games 3,1,4 and related canon stuff (DMC3 manga, comics & anime). Two is "20+ years in the future" and the events there might have been at least partially retconned by the fourth game. DMC2 feats for Dante shall be treated the same as PC feats for Etrigan
The powers and abilities are in use "as in for the latest version" but with no "absence presumption", thus Bangle of Time from DMC1 overlaps Quicksilver and four main styles of combat are applied as per DMC4. Doppelganger is present as per 3, flight/demonic form feats as per DMC1.
All the weaponry is avaliable from games 1,3, 4.
And now, when the rules of debate for our whitehaired demi-demonic beauty are established, let's see what helps him to kick Etrigan's ass: 1. Holy water grenade, Batman!
Now let's remember one simple fact - unlike Dante, who is full fledged halfblood, Etrigan is pure demon. He is closer to Warhammer daemonhost and his Jason Blood "anchor" form has little to no power. He also has all the lame weaknesses pureblood demons posess, including the one to holy items (Dante, on the other hand, as seen in the episode 4 of anime, Rolling Thunder, has no problem entering the church and stuff and is immune to stuff that is made to pin down purebloods) and even lamer one to iron.
Now, Dante (in all the games we analyse) has the habit to carry a flack or two of holy water... that are the must have items when you go againts the creature like Etrigan. Basically his cryptonite (when Etrigan can't say the same about Dante). 2. Speed kills you...with style!
While it's pointless for Dante to compete with Etrigan in terms of superstrength (dude dukes it out with Supes, Wonder Woman and other creme-de-la-creme of DC brickset), in terms of superhuman speed I'm yet to see some decent feats from Etrigan...Dante, on the other hand...
Let's start with some of the most famous stuff:
Our hero at his youngest shown (19 years old). Notice that according to the laws of physics object needs to reach at least Mach 5 speed for air to start burning around it due to friction.
"Bullet tennis" - one needs to have around Mach 1-Mach 2 reaction speed to perform a feat like that.
Missle dodging/missle surfing...once again shows superhuman reaction speed.
And here's just one - not even the best one - example of superhuman aim.
Superhuman accuracy+superhuman speed+a few flacks of hellfire to the firebreathing rhyming mouth=KO?
And there's Qucksilver/Bangle of Time to even chances a bit more.
3. The bigger they are...
And now let's talk about anti-brick powers aka the ones that basically nerf Etrigan's greatest asset - his "DC brick worth his salt" class strength.
Dante by himself is not very strong, I estimate his pure lifting strength as Class 15, maybe 20 (he has much better hitting force feats and blocking feats). However, in terms of blocking feats there's nifty Royal Guard style set of abilities that allow him to absorb the energy from enemy's hits (even Class 100 ones)... and redirect this energy back, using it to power himself up.
I won't even touch the fire breath cause Dante has stuff in his arsenal that allow him to either neutralise it (Ifrit, Agni/Rudra) or negate (Cerberus).
Given everything, stategy "KO using holy water&superspeed, finish off with Yamato cut-through-dimensions" blade works wonders at least 7/10.
I give maybe three wins to Etrigan's exotic powers such as matter manip, but let's remind you that here he (Etrigan) likely won't have time for anything that requires long casting/summoning rituals.
Guys asked for good analysis - I gave it to them. I didn't touch Etrigan's weakness to iron that breaks common knowledge rule (holy water weakness is obvious, ferrofobia for demons is nonexistant in DMC-verse) and think 6-7/10 outcome is OK, given speed and agility advantage, superhuman aim and weakness exploitation via holy water.
He mostly focuses his energy projection powers through the weapons - the "infinite ammo" of his guns is explained by the fact that he does not shoot actual bullets but magical energy blasts disguised as ones. That's why he can regulate the power of his shots from "ricochet the snooker balls" to "one-shot high level demons". That's his No.1 choice mostly.
Also, if, per Psycho Gundam's and mine stipulation, Dante has access to his arsenal from games 1/3/4, he has wide array of elemental weapons, some of them allow him either block or counter Etrigan's energy projection (Ifrit or Agni& Rudra for "firewall", Cerberus to cool the opponent down a bit).
He also can fire electrical blasts when in regular demon form (that ability is amped by Alastor or Nevan weapons).
Also let's don't forget Sparda DT/true demon form from DMC where he's highly resistant to most magic spells and can summon "fire dragons" - large fireballish stuff.
By the way, Dante is winning this 10/10 in a f***** stomp. This is a none fight. He is faster, stronger, more durable, a better fighter, more powerful, more skilled... etc...
Batman has gave etrigan a fight and held his own.
Dante is KILLING him and I cant wait for Mike to show me this speed feat.
Also, Etrigan has two weaknesses - one is common knowledge even in Dante's world and can be exploited given the slightest chance - holy water, the second one is really lame (iron), I won't count on it as common knowledge, and whether or not it gets exploited depends on the battlefield.
I have presented the analysis covering most exploitable weaknesses of Etrigan. Some physical\magical durability feats for Dante will be presented later if needed.