The old Lion guard now only consists of:
Besthe,
Ono,
Fuli,
and Bunga.
At the time of 'The Dark Roar Returns', They're all fully-grown and have matured through their past experiences.
Bunga is less foolish and reckless with his actions and is a bit more calm (And less annoying) as an adult.
Fuli has better control of her anger and has learnt how to teach others to improve their speed.
Ono is less worry-prone by his accidental decisions and a bit more confident in forming plans.
Besthe is still Besthe but has improved his fighting skills.
They no longer say their group catchphrase but they have toned down their individual phrases.
Currently, they are helping the new guard (Aisha's guard) train to face any future dangers (Like Kion).
Trivia[]
I know there's already a page for the Lion Guard group but I just wanted to show how they're progressed as adults on my own group page.
Bunga lives in an unknown location which Timon and Pumbaa won't disclose (It could be Hakuna Matata falls but that could already be occupied).
Besthe lives with his own pod.
Ono is now a lone bird.
Fuli is still a lone Cheetah but Rafiki lets her stay in his tree with Makini and Zahra every once in a while.
*As of 'The Dark Roar Returns', they're all visiting Pride Rock to train Aisha's guard for future dangers.