Linnaea takes her name from linnaea borealis, alternatively named twinflower. She's the same age as Mari and they get along well. It's Linn for short!
She's a bit of a pillar of support for the more delicate Mari, though I tried to include a sense of delicacy in her own design, too. She's definitely more prone to the wistful look, it seems.
She was actually the next-to-last character I designed out of all of them, but she gets introduced first here since she appears in the first chapter alongside Momo and Mari.