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Filo (フィーロ Fīro?) is a Filolial purchased alongside Raphtalia during the outset of the story. She develops into a Queen due to her association with the Shield Hero, and is a staunch ally to the hero, as the possessor of unique class-up effects. She also becomes particularly close to the Second Princess Melty.\
Filo's Appearance has changed many times, depending on her form.
When Filo was born, she was a small, pink chick who looked to be about the size of an average chick. After a day, and some leveling, she had grown to the size of a steamed bun. Filo's third appearance change would be to that of a small, baby ostrich, not quite large enough to ride on, but definitely larger than her two prior forms. Filo would then grow into her fourth beast transformation, which was the size of a normal ostrich, and she was now capable of being ridden. It should also be noted that Filo's feathers had started to turn into a much lighter shade of pink than in her prior forms, and were beginning to turn white. Filo's last and most current form is larger than an ostrich and resembles an owl, her feathers are also almost completely white aside from a small ruffle on her abdomen and some feathers on her wings which still contain pink.
Filo can change to her human form that can take the appearance of a young girl with wings on her back. She wears a white dress with a blue bow on the center made out of magical crystal threads so they don't break when she transforms into her beast form.
Her eyes in both forms are blue. Filo later gains a cowlick (a third long feather in her Filolial Form) that sticks vertically out of her head. This hair is a symbol of Filo's succession from the Filolial Queen, Fitoria.
Filo's personality has varied greatly throughout the story. Filo originally acted like any normal animal, prior to her transformation ability. She ate a lot, showed a great amount of affection toward Naofumi, and even convinced Naofumi to sleep in a stable with her because she was lonely, by pulling on his mantle. After Filo gained the ability to transform, her personality became that of a spoiled child; she would refuse orders until she was fed, would throw fits when Naofumi wouldn't sleep in the same bed as her, and would randomly transform whenever she saw fit. In an attempt to try and fix her personality Naofumi threatened to sell her (and with a little help from an advanced slave mark) Filo began to behave much more appropriately. Since that point, Filo became a trustworthy and reliable member of Naofumi's party. Filo since has worked hard to gain Naofumi's approval so that she won't be pushed aside if something should happen to her (though it is unlikely Naofumi would really ever do that and instead used it as a threat to discipline her).
Filo has also shown to be very caring, she loves Naofumi very much and considers him "her property" and often reminds Raphtalia that she "won't lose to her." She has shown a great affection toward Melty, the second princess and even so went so far as being unable to defeat an enemy because she thought the enemy looked like Melty.
Though she is comparatively smart to others of her own kind, she mostly an airhead and doesn't pay much attention to anything that she has no interest in. She will often doze off when others are talking about things she has no interest in. She has a poor understanding of behavior, culture and common sense
She is attracted to shiny objects, music and loves to sing. Filo also loves to swim and can go underwater holding her breath for hours.
Since she is a bird, she collects all the shiny objects as her treasure though they really are just trash. She enjoys singing and learns a song in every tavern they visit by watching the regular patrons, before joining them. She also sings a lullaby for the new slaves of Rock Valley village, to make them sleep comfortably. According to Naofumi, Filo was interested only in food, cart, and Melty.
Filo has a boundless appetite and has poor table manners which contradict her appearance. She eats everything and anything, she even once remarked that she thought that her own kind looks delicious. But, she hates alcohol and rucolu fruit. In nature, she hates dragons.
Filo is way too talkative and most of her conversation don't make any sense. Filo can figure out and say exactly the things people are trying to hide. Her bluntness is mostly due to her naïveness which sometimes deepens the other person's wounds. She is good with magic and quickly learns it and can also judge other beings level of skill with magic. She can see through lies, this was shown during the party exchange when she revealed to Raphtalia the actions, lies, and motives of Itsuki.
Filo has a strange way of associating others with items rather than remembering by names, like calling Motoyasu as Spear, Itsuki as Bow, Ren as Sword, Eclairs as Red Veggie, Ost as Turtle lady, Glass as Fan lady or a see-through person, Therese as sparkle person, L'arc as Scythe, Kizuna as fishing lady, etc. Though there was no ill intent and her way of remembering them, many find it to be hurtful for being remembered anything other than their name. Once she referred Imya as a delicious looking kid which became a horror for the new slave kids. After spending time with Melty, she displays more fitting behavior, as she was clearly disturbed for Naofumi's threatening of using her to eat the bandits which were not the case earlier.
Filo is a good judge of character and is able to see through anyone, this is shown many times such as Filo refusing to let Raphtalia have Naofumi(Knowing Raphtalia's feelings for him), Naofumi's strange or rude thoughts, Motoyasu's intention and also Itsuki's personality. It was this trait of Filo that convinced Naofumi to trust Melty, as Filo completely trust her. She’s been reserved as of late, but from the start, she’s been overly intrusive.
If nothing else, Filo completely lives and rely on her instinct which are absolute according to Naofumi.
Filo was originally born from a monster egg which Naofumi purchased from the slave trader, which the trader used as a business front.
Once, Filo overheard the slave merchant talking about her and that the filolial egg which he sold to Naofumi was a cheap one. The egg was from two flightless birds which was meant to be raised for the meat. The egg was worth 50 pieces of silver the same as the adult species.
Her fate changed when Naofumi picked her egg and raised it.
- Filo's egg was purchased for 100 silvers, Her advanced monster crest was 200 pieces of Silver and 40 pieces of silver for her clothes, making it a 340 silver pieces as her initial investment.
- The Slave trader was willing to purchase Filo for 30 Gold coins.