I like to think that all the ninja are conveniently attractive in some way but each had their own imperfections.
Lloyd has this god-like inhuman-like blessed by aphrodite beauty, definetely coming from his dragon and even oni genes. His green eyes are def an unatural bright tone that either freaks people out or make them swoon. But due to his human genes, he also had a few imperfections. After the tomorrow's tea he had lots stretch marks and his fair share of acne. Luckily, his big brothers and sister helped him take care of it. He also had lots of voice cracks between s7-8 before his voice finally reached a lower pitch, and he was very self concious about it. In s8 he didn't want to say anything, but he was DYING for the ninja to notice his lower voice and was very happy when they did. Later on they complimented it too. He never thought of himself as attractive since he got bullied a lot in darkley's, his looks included (bowl cut trauma) and despite the endless compliments from fans and even his family, Lloyd can't bring himself to actually accept them or believe them. (Dude has no self esteem)
Kai had always been the boy-next-door kind of attractive. The kind of guy every girl (and quite a few guys) on primary, middle AND high school had a crush on. He had his own handful of secret admirers, love letters and confessions. It fed his ego quite a bit, especially since he often compared himself to other teens his age since with his constant work as a blacksmith he never had much time to take care of himself, but it also made him scared to lead people on and he struggled to find ways to reject them as nicely as possible. As much as he liked the compliments, he prefered to find someone who liked him for more than just his looks. He def had lots of bad hair days and used to be insecure about his unatural spikes before he decided to take pride in it and gel them up. He also used to hate his scar and considered wearing an eyepatch to cover it up before seeing fan comments saying it made him more attractive.
Nya is just straight up model material. Twining her brother, she was also the girl-next-door kind of attractive that made little boys and girls have butterflies and try to shoot their shot before Kai scared them off. When she hit puberty she def had that phase of thinking she was the most hideous thing in the world despite how much others told her otherwise. I hc she has an hourglass type of body and was even a little bit chubby before becoming a ninja. Her hair is constantly oily and it made her consider just shaving her whole head off before she finally found the right products to use. During Skybound when people were still being sexist towards her she couldn't go a single interview or post a single picture without people commeting on hee body, hair or makeup. It got to her eventually, to the point Jay and her brothers had to forbid her from looking into social media for a while and picked a fight with every single bad comment. Nowdays though, she def got some confidence from her brother and freaking KNOWS shes gorgeous and Jay reminds her of it everyday.
Cole had always been a big kid, even before he was a ninja or trained at all. It made him insecure how he stood out in his dancing quartet since his broad shoulders and build made him look much older and more awkward around the other kids. Little did he know they actually admired him and were half intimitaded and half in awe. He was bullied for being fat in middle school, which made him start working out at very early age. The ninja have no idea that he used to be actually bullied in school, but when he told them they stopped making the fat jokes and kept apologizing for over a month. They wouldn't admit even at gunpoint, but all of them (Kai, Zane, Lloyd and even Jay and Nya who are dating) agree that Cole is attractive, and caught themselves staring while he worked out more than once. (Just to highlight, Lloyd admires him in a little brother kind of way and the others in a platonic way but if you wanna see it as something else its up to you)
Zane is the gentleman, actor type of handsome. Strong jaw, well-built, perfect hair. As a nindroid, he obviously didn't experience any human imperfections like the others and it took him a while to understand what people saw in him to think he is attractive. When he turned into the titanium ninja, though, he did not like what he saw in the mirror for a long time. His friends, however, helped him think better of himself and pointed out all his features that still looked like the Zane they knew. As fans also started commenting on how handsome he still was a full-on robot, he started to truly take pride on his looks. He still doesn't fully grasp the concept of flirting though, and is definetely confused by most of the pick up lines thrown at him. And no, he doesn't understand why his brothers and sister get so coy when he compliments them on how they did their hair or just holds the door for them like the gentlemen he is.
I'm sorry, but Jay was definetely that one kid that took his sweet ass time to have a glow up. Freckles and hair he was always insecure of, corcening amount of acne and crooked teeth since it took a while for his parents to be able to afford getting him braces. When he moved to the monastery he started straightening his hair and using concelear. When he and Cole had that whole fight over Nya, Jay was constantly comparing himself to Cole. After they made up and Jay started dating Nya, his girlfriend and best friend were his main cheerleaders to finally let his natural hair reign free and his freckles show. He still catches himself doing self comparisons to the other ninja from time to time, but thanks to his yang's constant reassurences and comments from fans who favour him he's gotten better. He's definetely the type of guy that leans more onto cute tik toker over hot model, but he still prides himself in it that people often put him in the same pedastal as his teamates.
Anyways, they're awesome and they're pretty.