As of October 2023, there is no "Guardians of the Galaxy 4" officially announced. "Guardians of the Galaxy Vol. 3," released in May 2023, is considered the conclusion of the main story arc for this group of characters. Director James Gunn has indicated that it serves as a farewell to the current team. Future appearances of the characters in other Marvel Cinematic Universe projects are possible, but a fourth film specifically centered on the Guardians has not been confirmed.

The seven Guardians of the Galaxy are: 1. **Peter Quill / Star-Lord** - A human with a mixed heritage who leads the team. 2. **Gamora** - An assassin raised by Thanos, seeking redemption. 3. **Drax the Destroyer** - A warrior seeking revenge for his family's death. 4. **Rocket** - A genetically modified raccoon with a knack for technology and weaponry. 5. **Groot** - A sentient tree-like creature who can only say "I am Groot." 6. **Mantis** - An empathic alien with the ability to sense and influence emotions. 7. **Adam Warlock** - A powerful being with a complex history, introduced later in the series. These characters form a diverse team fighting to protect the galaxy.

Miley Cyrus voiced the character Mainframe in "Guardians of the Galaxy Vol. 2." Mainframe is an artificial intelligence and a member of the Nova Corps, appearing briefly in the film. The character is part of a group of heroes who assist the Guardians in their adventures, contributing to the film's themes of teamwork and friendship. Cyrus's role adds a unique touch to the character, showcasing her talents in voice acting.

As of October 2023, there are no official plans for "Guardians of the Galaxy Vol. 4." Director James Gunn has indicated that "Guardians of the Galaxy Vol. 3" was intended to be the concluding chapter for this specific storyline and group of characters. However, the Marvel Cinematic Universe is known for evolving, and future projects may feature the Guardians in some capacity or new storylines involving different characters. Keep an eye on official Marvel announcements for any updates.