Clay is pan. Though he's never viewed anyone romantically other than Peril, he has never judged anyone in any way based on their gender and has always felt like he was pan.
Tsunami is bi with strong straight tendencies. She has never had a crush on a girl before but isn't completely revolted by the idea of dating one. She is hard to attract but once she's attracted to someone, she rarely gives up easily. She once had a crush on Starflight though it lasted only a few months. She then developed a crush on Clay that lasted a fair amount of time.
Glory isn't sure if she's bi or pan. Her first crush was Clay though it only lasted a few months. She then developed a crush on Starflight that only lasted a few days. Her next crush was on Sunny, though it was mainly just a testing time while she figured out her sexuality. She also had a crush on Tsunami for quite a while which actually brought the two of them together from feuding to just regular old friend-teasing. Then came her crush on Deathbringer. We all know how that turned out 😊
Starflight is straight. He once had a crush on Tsunami but once he told her about it, she ridiculed and teased him about it for a bit as he gave up. He eventually fell for Sunny who didn't return the feelings. After having his heart broken twice, he was hesitant to look for love. When he vented about this to Fatespeaker, she helped him through it and he eventually returned her feeling for him.
Sunny is aro. Which means that I can't talk about her crushes... because she's never had any...
Moon is bi with straight tendencies. She once had a crush on a RainWing male dragonet who eventually came out to her as trans female. Moon still liked her afterwards which made her consider whether she was straight or not. She was always to shy to tell her about her crush, though, and it soon fizzled to regular friendship. And then the whole Qinterwatcher thing happened.
Winter is straight. He never had a crush on Qibli. He had a childish crush on Lynx that eventually caused them to have a blood oath that they would be eachother's first kisses when they were older but Winter soon forgot about the pact. Later in his life (after he finally accepted that Moon didn't like him), Lynx brought it up and they both had a quick laugh. Later on, he and Lynx clicked again and Lynx said that she had honoured the pact and never kissed anyone. It turned out that Winter had accidentally honoured the pact as well. Then the two of them honoured the pact by kissing.
Peril is bi. Her first crush was on the daughter of a SkyWing cook, but Peril accidentally became a cook herself by making a flambé. Ingredient: her crush. However, their first kiss (also their last kiss) definitely caused sparks to fly. She thought that she was lesbian once she learned what that word meant (Queen Scarlet is very homophobic) but then she met Clay.
Turtle is bi with gay tendencies. He's had crushes on various male dragonets at the castle and Kinkajou was his first female crush. However, he didn't really hit it off with Kinkajou. He was then comforted by his closeted gay pal, Umber. A while later, Umber came out as gay to Turtle. Eventually, they started to act as if they were dating before actually becoming boyfriends.
Qibli is pan. He often has fleeting crushes on dragons he thinks are cute/handsome/beautiful but rarely one that sticks longer than a few days. His first actual crush was on Sahara, a non-binary dragon who was part of the outclaws because their parents (both now dead) were. Sahara, sadly, was aro so Qibli stood no chance. He eventually went to JMA where he met Moon. Yes, at some point he did have a crush on Winter, but it only lasted two and a half days.
Kinkajou is questioning but leaning towards aro. She never really had a crush on anyone before.
Blue is pan. Cricket was his first crush but he just knew he was pan. The rest you know from canon.
Cricket is bi with lesbian tendencies. Blue was her first crush just as she was his but she has had many many crushes on characters in some of her favourite books.
Sundew is lesbian. Her first crush was on Tigerlily and at one point they kissed but their love fizzled out as Sundew's parents were homophobic and therefore they could never be dating in public. Then Willow happened.
Luna doesn't know for sure what her sexuality is, only that it includes liking boys.