A quiet and timid stag, Fieran is a lot less intimidating than his large antlers, skull mask and relatively tall frame would have others believe. Despite his height, his slender frame gives him a sense of fragility. He is a contradiction; he yearns for company, yet he is too afraid to seek it due to a fear of rejection. As such he spends a considerable amount of time alone. He doesn’t often approach other deer, waiting for them to greet him; however, if he’s feeling particularly skittish, he’ll sometimes simply turn and run from others, which causes him to come across as aloof rather than hesitant.

Any friends that Fieran does manage to make are precious to him, and he is incredibly loyal. While not physically strong, he’s very agile and a fast runner, so he enjoys playing chase, though he’ll also be glad for a rest in the sun afterwards! He's a little on the clumsy side due to his rather lanky frame and the fact that he is still not used to this new body yet, and has a tendency to trip over his own feet. When comfortable with another deer, he will give them lots of nuzzles to show how much he appreciates them. He’s not too comfortable with others casting mask spells on him due to the sense of security he gets from hiding his face behind his own familiar mask, but will occasionally allow others to cast spells on him if he trusts them, or if he doesn’t want to come across as rude.

Fieran does not remember his other life, only a sensation of drowning; this is the cause behind his fear of the lake's waters. Though he still remains in a state of bewilderment about his surroundings, the forest brings him peace. He sometimes sits by the lake's edge, staring into its surface as if it will bring him answers. He also enjoys resting at the playground and by the crying idol.