So. We all know about Leo’s sparkle. And yes, I mean literal sparkle
Example
He has a higher sparkle count, these are just the ones I could find. Which leads me to a headcanon
What if the sparkle isn’t the animators just being funny. Leo can legit generate sparkles? Like as a part of his Ninpo. He started doing it as a kid but they just never questioned it (Donnie questioned it) because. Leo. It’s Leo, ofc he found a way to make sparkles whenever he pleased, it’s him.
You can surgically remove this headcanon from my, cold dead body, thanks for listening to my Ted talk.
Donnie would absolutely blow a fuse if someone ruined their books with how sacred he was to that mint condition comic, and I’m sure Mikey thinks cooking is an art. Cross either of them and it’s hell to pay!
I read a lot of book series that had been handed down to me by my siblings, but you could really tell whose they were before based on their condition. One sibling left foodstains and dog ears, another left spine breaks and ripped paperbacks, and the final would threaten my life if I so much as dented a page. Such is life with shared things
I guess you could say those books were well loved, for better or for worse lol
So the Red-eared slider fluttering thing they do with their fingertips is generally seen as an affectionate thing they do right?
What I’m trying to say is whenever his brothers are feeling sad/guilty about something they did or something that happened that targeted/mainly affected Leo, Leo will go to whichever sibling is feeling said way, grab their face and cup it in his hands and gently tap his fingers against their cheeks to remind them that he loves them/show them he doesn’t hold it against them.
He’ll also just go up to them and do it randomly, especially if one of them is just feeling down in general because he knows it makes them laugh.
Yes, he’s done it to splinter too, but only when he was a baby. Splinter would be holding him and baby Leo would just gently grab his snout with his tiny baby hands and flutter his fingers. Splinter never thought much of it until Leo was a little older and he decided to look into it and realized it was a common trait among Leos species
Edit: when Leo is feeling sad/down the others will go and do the fluttering thing to him. Leo loves it and it always cheers him up because it shows that they pay attention to him and who he is, along with his personality traits. The first time one of them did it to him it made him so happy he started crying.