The little one, Denby?, is super cute. Seems like such a trouble maker, and those big eyes! Very cute. I love the interaction between the three of them in the last two panels, the expressions and the little guy's expressive tail <3
Locks are very tall and slender "by nature". In their real form, they are a eel-like creature and their size can vary from a tiny mammal to something 10x bigger than a planet or a sun. They don't have bones or organs, they are void creatures, so what's inside them is actually the Void itself. Their anatomy is just the illusion of it, likewise with any form they might take. They have no "physical" limitations per say.