Liskarm's shield's function and, to an extent, character design is inspired by Blitz's. As a matter of fact, she is jokingly paired with him in the Arknights community as "father and daughter."
As TOKI, Liskarm's illustrator, had left Hypergryph in around 2021 to work on his own new project, Liskarm's Overloadoutfit which is released after TOKI's departure is drawn by Cenm0 instead.
Her files point out that when Liskarm is using her Arts, her horns glow a bright cerulean. In practice, they are only shown doing so when Liskarm is activating her second skill while wearing her Overload outfit.