I can't reply to everyone but it was fun reading everyone's reply!! And yes I understand that some detail are literally a cardinal sin if it's removed from the character lol
(Also thank you @Wormancer sdfdfsfs I'm happy to hear that ;-;)
You know if I tried to look hard enough in my characters' designs I feel like almost everyone have their trademark design trait, intentionally or not?? I could try listing them like, literally now but I'll try to summarize them this time-- On mobile rn so I'll link images later.
- Kureha often use the same ribbon-like hairband(?) for his ponytail? Either when its tied as low or high ponytail. Also he often cover his arms with any type of wristband. Not that both are that important or iconic, but he's just never change the color/type of his hairband thingy and I often feel odd if Kureha's arms were exposed despite there's nothing underneath it hahah
- My friend also point out that his blue eyes stand out in contrast with his monotonous color scheme...I believe that's also goes for Reika's bright orange hair when everything else about her is just purple
- Ahoge team: (You know, the antennae/sprout-like hair on top of their hair) Kozue, Sakane, Kiyo, Yunosuke
- Choker team: Kiyo and Inugami
- I consider Kiyo's sharp eyes is a trademark and basically the reason I'm super picky on commissioning him because making his eyes any bigger or smaller is just not him sgdfdfdfs
- Inugami's black nail polish was an addition by my friend that I made canon, and now I highly associate it with him lol
- Ayumu had a drastic appearance change during her past but two things she kept are her pink sweater and hairclips (Spoiler image here....)
- Saki and Kazuki have matching necklaces/lockets for unknown reasons, I sometines forget to draw them because of how small they are but I should draw it more often because I feel like that's the only remaining proof that they're close (as siblings), despite how things have gotten downhill for them now
In all honesty though most of them will never be as iconic as my association of Kokoro and her ear flaps?? I'm willing to collect any ear flaps I ever find physically and almost considered ordering a custom one if I could find any makers for them hahah
Edit: Added links and more description for some of them!