My ninjago "headcanons", but I only talk about Greenwind/storm.
[This is partially from an AU.]
Lloyd
Fullname: Lloyd Montgomery-Garmadon.
Pronouns: He/Sun/Pup/Solar/Purr.
Gender: Trans man.
Age: 16 (mentally, physical age is just assumed based on looks.)
Element: Energy/Gold.
Colors: Green and Gold.
Disabilities/Illnesses: Binge eating disorder, chronic fatigue, AUDHD, BPD.
Notes: Will very rarely use crutches, but only if absolutely necessary as sun hates being a burden. Hates using his mothers last name, but is forced to for "legal reasons", and despite Emperor Garmadon ruining the Garmadon name, solar still prefers it over his mother's.
Fullname: [Redacted] "Morro" [Redacted]
Pronouns: He/They (doesn't use neopronouns himself, but is chill using Lloyd's)
Gender: Nonbinary, AMAB, fairly androgynous.
Age: Approximately 17, though exact age is unknown. (physically and mentally.)
Element: Wind/Storm.
Colors: Green, Silver and Black.
Disabilities/Illnesses: ADHD, POTs, undiagnosed BPD.
Notes: Ambulatory wheelchair user, partially due to POTs and partially due to mobility issues after being dead for a few decades. They cannot remember their birthday, at all, and had never celebrated it while being a student under Wu, instead Lloyd gave him an honorary birthday as the Day of the Departed, mostly as a joke but Lloyd still goes out of his way to give them gifts.
Extras/Explanations;
Lloyd was in and out of the hospital a lot between season 2 and 4, as the sudden use of most if not all of his power made solar incredibly sick, only to have the power stripped away from sun again after getting used to it, ruining his immune system and muscles.
A little after season 4 however, solar has a sudden little voice constantly following pup around, mocking his every move. But it isn't until the museum visit when Morro actually possesses him.
I will be skipping over the possession arc, because even summarizing it would be too long, but afterwards Wu takes Morro's arm, and is able to pull him up out of the water properly, giving them a place on the team.
After being revived however Morro's taken to hospital (along with Cole, for check ups after being revived), he had been barely able to walk ever since being revived, and was practically forced into a wheelchair. They hate having to use it, and unfortunately it does mean he is unable to do usual ninja duties and is bound to help around the bounty and rarely help out in the field. It doesn't stop him from training or sparring with the others from time to time, as they do try to keep their strength up.
Being home-bound however did mean that while Lloyd was ill, they had time to bond, mostly over Disney movies and cheap snacks.
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I shall leave anything else for another time, but I thank you for reading my ramble about greenwind/storm. May the wind find you well, and the moon be your guide.