—Description of Arcas from Witchpedia
As with other members of his species, Arcas resembles a gigantic polar bear with a golden badge in the middle of his face and twice the height of normal polar bears, which already a species of large bears.
Being the designated protector of the Fountain of Polaris, he fiercely attacks anyone who approaches it. However, it retains its affection for Chariot and doesn't try to attack her when he encounters her, having treated burns he sustained from the lightning strike when he was very young.
- Arcas's badge resembles that of Alcor's, Ursula's familiar (and an eponymous toy of Akko). Likewise, the four-pointed star adorns Chariot's hat and appears on the breast of Chariot's bird form. In "Yesterday", it is revealed that Arcas knew Chariot since childhood and had a friendly relation with her.