Fennel is an elf Alyssa met 100 years prior to finding Viola. He was a lost child in the woods.
Now that he is "grown-up" he is completely in love with Alyssa, but is too cowardly to confess his feelings. Alyssa sees him as a "little-brother". He often fights with Viola as she does not want him to get close to Alyssa, but in truth is fond of her and thinks of her as family too.