With Iridikron in The Last Titan. His hatred for the Titans is more than understandable, and with Vyranoth on our side and after Xal’atath inevitably pulls the rug out from under his feet, he will begrudgingly side with us.
Then, after the Worldsoul Saga, he will head west to Avaloren to lead the heretical Primalists that set up base on the other side of the world.
*source: my uncle is Mr. John Blizzard and he told me 
A large part of why Vyranoth joined our side is because she realized that Iridikron had abandoned her with Fyrakk as some diversion in his plan.
I don’t think she’s to keen on her last brother at the moment. Also, he’s the one that handed Xal’atath the dark heart. So pretty much everything that’s gone on since then is his design.
I don’t see us teaming up with him, but I definitely see him creating a scenario where we fight the Titans anyway. Which seems to be where this is going. With void spreading unchecked and the device that remotely re-originates disabled, The Titans themselves will have to turn up to hard reset the planet. We won’t allow that.
The stage is sort of set.
I don’t know, I still don’t really get Iridikron’s deal. His hatred for the Titans burns hotter than shadowflame, but the Titans haven’t done anything that the other 5 forces of reality aren’t also trying to do. The Titans just happened to further the cause of control better than the other 5 forces for most of existence via control of the world souls, and now the game is back on once Sargeras wiped out the Pantheon.
Sure, the Titans are jerks, but no more than any other cosmic force in the entire cosmos. Iridikron is a mystery I can’t predict.
It makes more sense if one reads the War of the Scaleborn novel (not to open that can of worms lol) because while the game outlines what the forces of Order did to the wild dragons, i.e. stealing their eggs and forcibly Ordering them, it feels way more visceral in the novel, especially from Vyranoth’s perspective. Also I wouldn’t be surprised if a large part of the enmity comes from Iridikron blaming the Titans for driving a wedge between him and Neltharion, since apparently the two were like brothers in their youth.
Personally, I’d love Iridikron as an anti-hero “villain” towards the titans, as Illidan was to the Burning Legion. 
… But sadly, something tells me they’ll make Iridikron predictably too short-sighted, in some manner of stereotypical “Blinded by hatred” sort of ordeal and he’ll be a villain anyway 
His deal with the Titans is personal because they monkeyed with his race to create the Dragons and the Aspects. His sister becoming one herselrf is salt in the wound.
It is pretty simple. It is not about ‘which force is worse.’ It is about which force effected him. He is not pissed at the Titans because they are trying to order the cosmos. He is pissed because they ordered dragons. It is not logical, it is emotional.
Yeah, it makes sense, I know that’s what they’re going with now, but before, Iridikron was playing this game of “oooooh, I know a secret about the Titans you don’t, something that will blow your socks off!” except he totally doesn’t. His past talk doesn’t line up with a personal hatred.
I can’t think of anything he said that doesn’t line up with a personal hatred for the Titans for ordering the dragons. Dragonflight was pretty explicit on the reasons he hated the Titans.
I think his “I know a secret about the Titans you don’t” talk was just rhetoric he uses to try and get people on his side or turn them against the Titans.
His secretive line, which I assume is in reference to the “Do you ever wonder why the Titans preserve this timeline?” that he asks Chromie, is probably intel he got from Xal’atath. And whatever it is, he probably believed it since it would reaffirm his (understandable) mistrust of the Titans. And his past does line-up, because he hates what the Titans did to the wild dragons, and especially his close friend Neltharion.
I don’t think we’re going to team up so much as I think we’re being molded into the weapon Iridikron is going to throw at the Titans. In Dragonflight he frequently warns the other Incarnates not to underestimate the champion of Azeroth, stressing the need to recognize how many large threats we’ve removed in the past. TWW and Midnight, and all Xal is doing is a team up to push Azeroth toward the void and draw the Titans into stepping in directly, which will inevitably leads to us facing off against them because the Titans are not going to return to give the place a good decontamination - they’re going to destroy us to avoid a void-tainted world soul.
unless his visage form grow some boobs and show some feet its not going to happen, he is a male and they die in this game.