OK, but I partially disagree with this headcanon, and hereās why:
1) Bruce isĀ totally playing Gamora. You donāt think Bruce Banner has played Dungeons & Dragons before? Bruce Banner hasĀ absolutely played Dungeons & Dragons before. He played all through high school and college and when Bucky announces the campaign Bruce jumps at the opportunity because he just misses it so much (mostly rose-tinted nostalgia goggles but). So he sits Bucky down and asks him for every bit of info he can on the setting and spends a whole night with a pot of tea drafting up the five-page backstory for his space assassin and her family tree and her struggle with her relationship with the villain and comes to Bucky with a fully-ready character sheet and a list of things Bucky will need to OK before Gamora hops in.
Bucky quietly resolves to integrate as much as he can into the story, mainly because Bruce came up with some better ideas than heād had.
2) Tony is definitely playing Quill, because Tony has never played D&D before. You donāt get to be where Tony Stark is in life and have much free time. He does what a lot of newbies do and bases a character on himself, or at least the parts he likes: clever, snarky, pre-ā90s musical taste, beds space babes, heroic sometimes probably. He wants to be cool but has no idea how to be cool within this context (āMy characterās name is Starlord.ā āWhat? Tony,Ā no.ā). He hogs the spotlight all the time (all the time) but clearly has no idea what heās doing and when someone whoĀ seems like they know what theyāre talking about gives him advice he always takes (āIām going to need that guyās leg.ā āSeriously? Alrightā *Rolls to grapple*).
Quillās backstory is primarily Bruceās doing. Tony just handed it in with a āyeah whateverās on there.ā
3) Thor is playing Drax but didnāt join until a few sessions in when he tagged along and decided it looked like fun (āTHIS PLEASES ME! ALLOW ME TO JOIN YOUR TALES OF ADVENTURE!ā). He definitely needed help constructing his character sheet, but he had no problem coming up with aĀ character. Bucky asked him what he wanted to play and got that glint in his eye and responded āI WILL FORGE A HERO WORTHY OF THE ANCIENT TALES OF ASGARD.ā And he put a lot of thought into Drax, both in personal history and personality. Heās mostly modeled on Thorās favorite Asgardian folk heroes, with some personal flaws and quirks thrown in that Thor thinks are interesting.
Of course Thor doesnāt really understand theĀ game part of it, heās in it for the story (āThor what the hell man thereās no way we can take on Ronan at this level!ā āAH BUT THINK OF THE THRILLING DRAMA OF THE MOMENT DRAX AND RONAN MEET AGAIN!ā āWe are all going to die.ā āAND IT WILL BE A THRILLING TRAGEDY!ā)
4) Steve is absolutely playing Rocket but what started as a complete joke ballooned into a fully fleshed-out character with a tragic backstory. Steveās an artist, heās a creative guy and little too creative for his own good sometimes and bouncing his ideas off of Natasha turned a simple joke into a more elaborate character dynamic than even Bruceās. He trolls Bucky a lot and itās even better for Steve when he really gets into Rocketās character and plays up the drama, partly because Bucky canāt tell if heās joking or not.
5) Somewhere in the brainstorming session, Steve and Natasha decided that Rocket has a partner who is a talking tree. Natasha pitches this idea completely straight-faced to Bucky and after the fiasco of Steveās character idea Buckyās just too tired to say no to the tree-man. Natasha gives him a bit of a backstory and how Rocket and Groot got together and it sounds pretty solid, so whatever, tree-man can stay.
Then when all the characters get introduced Natasha just hovers over Tony and puffs out her chest and says in her deepest voice: āI am Groot.ā
And Steve snickers and nobody has any idea why.
A session later Natasha is responding to everything Tony says with that same deep āI amĀ Groot.ā and Steve goes blue in the face trying to hold in his laughter and Tony cracks and the game has to pause for 10 minutes while Nat and Steve recompose themselves.
Nat also has a better grasp of the rules than Bucky realized and completely tweaked her character into being able to do basically anything she can justify. And itās all right there in the book, Bucky canāt even argue from a rules standpoint. Theyāre only level 5 Groot shouldnāt be essentially bulletproof but through some loophole in the rules, yep, there it is.
Natasha Romanoff is trained to exploit weaknesses. OfĀ course sheās a total munchkin.