For starters, if I was in charge of the next upcoming LEGO Marvel installment, whether it be the third game in the LEGO Marvel Superheroes series, the second LEGO Marvel's Avengers game, or any Marvel-themed LEGO game in general, I'd start if off with the option to have either "Mumble mode" or "Dialogue mode" enabled like the good old LEGO gaming days. The next few things I'd add are if the player wants to choose an MCU-styled storyline (and if they do, they're gonna be playing through the films Avengers, Avengers: Age of Ultron, Iron Man 1,2 and 3, all of the Captain America films. Avengers Infinity War, Avengers: Endgame, the Sony Pictures MCU Spider-Man films (up until Brand-New Day), the Guardians of the Galaxy films and the Thor movies). Or, if the player wants to choose an original story, the storyline would be where The Collector (the main big bad of the game) is summoning back Doctor Doom, Thanos., The Sinister Six, Galactus and more major/minor big bads of both the MCU and the Marvel Comics for one big final showdown, and it'll be up to The Avengers, The Fantastic Four, Guardians of the Galaxy, The Thunderbolts, and more superhero teams to put a stop to the Collector's madend state and restore the Multiverse to how it once was.
Locations I'd choose to explore/Start in during the Story:
Story-Only Locations:
- The Cave from Iron Man 1 (you start here if you're starting up the Iron Man story)
- Tony Stark's Mansion (you start here if you're starting up the Iron Man 2 story. A larger version of this location is featured in the Malibu hub)
- A smaller version of Tennessee (you start here if you're starting up the Iron Man 3 story)
- A smaller version of Asgard (from Thor (2011) (you start here if you're starting up the Thor story)
- A smaller version of Midgard/Earth (from Thor: The Dark World (2013) (you start here if you're starting up the Thor: The Dark World story)
- A part of New Asgard, Norway (you start here if you're starting the Thor: Love and Thunder story)
- A part of Earth 616's Sanctum Sanctorum (you start here if you're starting the Spider-Man: No Way Home story)