>>88819232Not really a set list of mannerisms, just some examples I can pull from the boys I have watched. Some general examples I can think of off the top of my head are Luca being an absolute kusogaki in pretty much every collab he's in, Altare being playfully whiny when he doesn't get his way, Ren being very excited about Nintendo games aimed at kids, and Gale being childish (positive) in general.
More specific examples
Struggling cutely, making yourself seem small:
https://www.youtube.com/watch?v=U8zRVJomw5c&t=317sExcited pirate boy:
https://www.youtube.com/watch?v=EfM13hIIJdI&t=685sKusogaki brats (this entire collab was golden and gave me cuteness aggression and laughs the whole way through. The biggest highlight was Uki being bratty and cute which was almost a completely new side of him that isn't shown much). 18:52 is another highlight:
https://www.youtube.com/watch?v=KsQkj28E8Uk&t=930sThis is something a little brother would excitedly do to his big brother:
https://www.youtube.com/watch?v=jq1ow9hq6r8&t=1478sA father and his easily impressed ADHD son:
https://www.youtube.com/watch?v=gT5qf1_Z2uICutely showing off:
https://www.youtube.com/watch?v=qDKZKxKF5TM&t=3835sOf course I had to include this stream:
https://www.youtube.com/watch?v=N6Zth2ch0IgAnd making cute noises and doing cute things with friends:
https://www.youtube.com/watch?v=gzfGXhDC0igThere's lots more I could share but unfortunately I didn't have much time today. I'm sure you get the gist of it and can observe more from watching more streams. Enjoy the cuteness!