Filo

Filo (フィーロ, Firo) is a secondary character on Isekai Quartet.

Appearance
Filo is seen in either her Filolial form or her human form;

Filolilal
In her true form, Filo resembles a white Filolial Queen with pink and white feathers, yellow beak and feet, blue eyes and a blue-collar around her neck. She is also seen with the accessory attached to her feathers that Naofumi gave her before the third wave of catastrophy in The Rising of the Shield Hero.

Human
In her human form, Filo gives off the appearance of a young girl with blonde hair with a cowlick that reflects her status as a Filolilal queen and blue eyes. She also has white wings on her back and wears a white and blue dress with a dark blue ribbon on the chest. She still wears the accessory as a hairclip.

Personality
She is somewhat childish and loves to play around with people she deems safe to play with

Plot
After being teleported to the world of Isekai Quartet, she ends up in the animal stall with Dread Knight and Hamsuke. She reunites with Ralphtalia and is nearly hit with a baseball hit by Mare, but is saved by Naofumi.

During physical examinations, Wiz had difficulty measuring Filo's height due to the winged girl's cowlick.

Powers & Abilities
Filo can transform between a human form and her Filolial form.

Naofumi Iwatani
Prior to the events of Isekai Quartet, Naofumi raised Filo since she hatched from an egg that he purchased from a slave trader. Even when she gained the ability to transform between a large bird and a winged human girl, she became clingy to him.

After ending up in the new world, Filo and Raphtalia were happy to reunite with Naofumi who shielded and deflected a magic-powered baseball before it hit any of them.

During Valentine's Day, Filo and Raphtalia were joyed when Naofumi gifted them chocolate.

During dodge ball game, Filo and Naofumi were in the same team. She said to him, "Come on, master. Lighten up a little and play.  This dodge ball game looks so fun."

Naofumi and their classmate Reinhard gave Filo a task to talk to people finding out what they wanted for the upcoming school festival. Eventually, Filo had Naofumi read The Ugly Duckling aloud for her. As a result, Class 1 selected to do an adaptation of the fairy tale.

Raphtalia
Prior to the events of Isekai Quartet, Filo and Raphtalia vied for Naofumi's attention and affections despite being attackers in his service. Nevertheless, they had a sisterly relationship.

After ending up in the new world, Filo was joyed to see Raphtalia. At first, Raphtalia protected her from a magic-powered baseball before Naofumi shielded them.

Reinhard van Astrea
Alongside Naofumi, Reinhard gave Filo a task to talk to people finding out what they wanted for a play in the upcoming school festival.

Ainz's Combat Maids
The wolf girl expressed curiosity on the library book Filo was holding and attempted at coming up with an idea. While the two black-haired girls kept the wolf girl on leash (even if it involved physical abuse), they were about to help Filo out finding an idea for their class' play. Eventually, the wolf girl picked The Ugly Duckling. Filo thanked the three ladies and the two old guys (that stumbled upon the scene).

Felt
Filo asked her classmate about The Ugly Duckling, "You okay with this one, Felt?" Eventually, Felt agreed that their class would perform an adaptation of The Ugly Duckling.

Student Animal Care Committee
After being found by the animal care committee, Filo asked them about her master Naofumi. After she gave two of them a ride, Raphtalia found her.

Filo approached the animal care committee and unwittingly gave them a surprise regarding news of the upcoming school festival. She asked, "What kind of stories do you guys like?" However, the giant hamster's suggestion caused the committee to bicker amongst themselves before one of them told Filo to talk to more people about it.

Ainz
Filo approached "the skeleton man/grandpa" and asked, "Well, uh, what I need, is to get your opinion on something". As she told him and his two companions about the upcoming school festival, she brought up "Hamsuke said he like heroic story of an undead". However, his two companions bickered before he told her to go ask the party of Kazuma.

Emilia
Filo bumped into "the nice girl" (who noticed something bothering her) and told her about upcoming school festival. As Filo told the girl "But everyone I talked to told me something different"; "the nice girl" told Filo to go to the library to find some inspiration.

Mare
Filo thanked Mare for giving her a library book that contained gentle fairy tales.

Beatrice
Despite the role was small, Filo thanked Beatrice and unwittingly irritated her by calling her "Beat It".

Koenig & Neumann
Despite doing nothing to help out, Filo thanked the "old guys".

Trivia

 * The presence of the cowlick seems to indicate that Filo and her friends were teleported to the school sometime after the Fourth Wave.
 * Normal filolials were ostrich-like creatures used to pull carriages and sometimes served as steeds. A filolial became a magical creature resembling a flightless owl when a Hero raised it becoming a king or queen and gained the ability to transform into a winged child. Thus, it is applicable to Filo who was raised by the Shield Hero Naofumi Iwatani.  Somehow, Filo was oblivious or immune to the witch's scent in Subaru Natsuki.