One sign that two or more people share a close-knit bond with each other is you'll see them standing or walking with their arms linked. You'll find many illustrations on pixiv of characters who share a deep bond striking this pose. It's an adorably relatable sign of affection, don't you think?
The iconic duo of Chisato Nishikigi and Takina Inoue (from Lycoris Recoil) are partners in arms in more ways than one!
Have you linked up with any of the illustrations below?