Where are ALL of the MCU heroes right now?

Last seen – Captain America: Civil War
Russian agent-turned-SHIELD superspy, Natasha Romanoff debuted in Iron Man 2 before becoming a founding member of the Avengers.
She sided with Iron Man in Civil War, but as the voice of reason sided with Cap when things started getting silly. She fell out with Stark and went on the run, hooking up with Cap and fighting alongside him in the shadows.

Last seen – Thor: Ragnarok
The god of thunder crashed to Earth in his 2011 solo movie, before joining the Avengers to help battle his adopted brother Loki.
Thor was conspicuously absent from Civil War but returned to our screens in Ragnarok, where he fought his long-lost sister Hela. The film ended with Asgard destroyed and Thor and his fellow Asgardians captured by Thanos.

Last seen – Thor: Ragnarok
While Bruce Banner's genius intellect made him a great help to the Avengers, his uncontrollable alter ego the Hulk proved to be a liability on various occasions. His bond with Black Widow managed to keep him in check (most of the time).
Banner went on the run at the end of Avengers: Age of Ultron, stealing an Avengers Quinjet and heading into space. He became stuck in Hulk form and fought his way to the position of champion on the planet Sakaar before reuniting with Thor. He was captured by Thanos along with his other allies.

Last seen – Avengers: Infinity War Prelude
Granted amazing powers along with her twin brother Pietro by HYDRA, Wanda Maximoff allied with Ultron, but eventually sided with the Avengers after the artificial intelligence revealed his homicidal intentions.
She became the focus of the Avengers' civil war after accidentally destroying a building in Lagos. She was imprisoned in the underwater prison the Raft, but was released with Cap's other Avengers and reunited in secret with her could-be lover, the Vision.

Last seen – Avengers: Infinity War Prelude
Flying army veteran Sam Wilson returned from duty in the Middle East to counsel other former military personnel suffering from posttraumatic stress disorder. He helped Captain America when he went on the run from the HYDRA-infiltrated SHIELD, and was the first to stick by Steve when he went rogue in Civil War.
Falcon was one of the Avengers imprisoned on the Raft. After his escape, he has been fighting alongside Cap and Black Widow under the authorities' radar.

Last seen – Black Panther
James Buchanan 'Bucky' Barnes was Captain America's best friend in the 1930s and '40s. He was left for dead during World War II, but was instead brainwashed by the terrorist group HYDRA and transformed into the mysterious assassin the Winter Soldier. Steve discovered that Bucky was still alive in Captain America: The Winter Soldier.
Bucky was framed for a bombing during Civil War, leading to the confrontation between Cap and Iron Man. He was put into cryogenic suspension in Wakanda, where Black Panther's sister Shuri devised a way to completely free him of his Soviet brainwashing. We last saw him recuperating by a peaceful lake. Lucky guy!

Last seen – Black Panther
Prince T'Challa of Wakanda was introduced in Civil War, where he was also revealed to be the country's hereditary protector/superhero, the Black Panther. When his father was killed, he ascended to the throne and swore vengeance against the Winter Soldier (who was framed for the murder).
After learning an important lesson about revenge, Black Panther saw the error of his ways and offered shelter to Steve Rogers and his Avengers allies in Wakanda, whisking Cap and Bucky away from the Siberian facility where they fought Iron Man. Back home, T'Challa established himself as a the new king after a showdown with his long-lost cousin, Erik 'Killmonger' Stevens, and revealed Wakanda's secrets to the world.

Last seen – Avengers: Infinity War Prelude
Vision technically debuted in Iron Man as Tony Stark's computerised butler, JARVIS. He was uploaded into an artificial body created by Ultron and given sentience by the Mind Stone, becoming the Vision.
Continuing to explore his humanity, he sided with Iron Man as the "logical choice" on the Civil War divide, but later defected to meet up with Scarlet Witch in secret.

Last seen – Avengers: Infinity War Prelude
SHIELD agent Clint Barton was first seen protecting the fallen hammer Mjolnir in Thor. He was mind controlled by Loki against the Avengers, but later joined the team until he decided to retire.
He came out of retirement to rescue Scarlet Witch for Captain America during the Civil War, but went back to be with his family (at least temporarily) after breaking out of the Raft.

Last seen – Thor: Ragnarok
The legendary Asgardian warrior ended her self-imposed exile on Sakaar and returned to Asgard with Thor to help battle the death goddess Hela.
After Asgard's destruction, Valkyrie was among the Asgardians (and a lone Hulk) captured in space by Thanos's enormous starship.

Last seen – Thor: Ragnarok
Loki's most recent acts of 'mischief' included replacing Odin as king of Asgard without any of the daft populace working it out.
After doing the right thing (eventually, and under duress), Loki aided Thor and his allies against Hela and was instrumental in bringing about her destruction along with Asgard itself. He was one of the Asgardians captured by Thanos – but who else knows that he has the Tesseract/Space Stone in his possession?

Last seen – Captain America: Civil War
Colonel James Rupert Rhodes is a friend and former employee of Tony Stark. He donned Tony Stark's old armour for the first time in Iron Man 2 to stop his pal demolishing a party full of guests. As War Machine, he fought alongside Iron Man and aided the Avengers against Ultron.
Rhodey sided with Stark during Civil War, and was injured by a stray beam fired by Vision. He was last seen in recovery, learning to walk again with the assistance of a device built by Iron Man.

Last seen – Avengers: Age of Ultron
Alongside his twin sister Wanda, Sokovian orphan Pietro Maximoff received powers from HYDRA via the Mind Gem. With his super speed, he fought with Ultron until he realised that the robot was a murderous sociopath.
Quicksilver died during the battle of Sokovia when he needlessly stood in the way of machine gun fire in order to unlock the Noble Sacrifice achievement.

Last seen – Avengers: Age of Ultron
Nick Fury was the director of the US intelligence organisation SHIELD. He spearheaded the Avengers Initiative, and managed to recover Captain America after the war hero spent decades frozen in the Arctic. He went on the run in Captain America: The Winter Soldier after HYRDA was revealed to have thoroughly infiltrated SHIELD.
Fury emerged from hiding to help the Avengers against Ultron. He hasn't been seen since, but the upcoming Avengers: Infinity War is expected to reveal what he's been up to.

Last seen – Avengers: Age of Ultron
SHIELD agent Maria Hill serves as Nick Fury's second-in-command and deputy director of the agency, supporting him in his battles with the Avengers. She temporarily worked as a mole at Stark Industries for Fury and joined him in hiding after the collapse of SHIELD in The Winter Soldier.
Hill was last seen when she emerged from hiding with Fury to help the Avengers in Age of Ultron, and is presumably killing time with him in some secret bunker.

Last seen – Agents of SHIELD
The unassuming Agent Phil Coulson appeared (and was repeatedly dismissed) by Tony Stark and Peter Potts in Iron Man. He became a key contact between superheroes and SHIELD until his apparent death in Avengers.
He was revived by Project TAHITI and has since been a star of Agents of SHIELD (with no more movie appearances since). Currently he is trapped in the artificial simulation called the Framework.

Last seen – Thor: Ragnarok
Famed surgeon Dr Stephen Strange began to study the mystic arts after an accident damaged his hands and left him unable to perform surgery. After the death of the Ancient One, Strange is now on the front line when it comes to protecting Earth from magical threats.
He gave some assistance to Thor during his search for Odin in Ragnarok but is yet to meet the rest of the Avengers.

Last seen – Avengers: Infinity War Prelude
Scott Lang is an ex-con who was enlisted by the original Ant-Man Hank Pym to help protect his shrinking technology from forces that wish to use it for evil. He was then enlisted by the Avengers to fight on Captain America's side in the Civil War.
Lang was one of the heroes imprisoned on the Raft. After Cap released him, he returned to be with his daughter Cassie.