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Flan is a boy with light green hair and eyes of the same color, under both his eyes are blue triangular markings. While in the future, Flan's most defining feature is his large hat shaped like a frog's head, which Belphegor forces him to waer to symbolize him being Mammon's replacment. His main outfit is the Varia uniform from the future.
In the present, Flan is younger by around ten years. Instead of an oversized frog head, he instead wears an equally large apple-shaped hat. His main outfit in the present time is the Kokuyo uniform.
Flan has a calm demeanor despite being very antagonistic towards other people, constantly verbally attacking them without a slightest care of the consequence, which results in him being attacked back by several people, particularly Belphegor and Mukuro. In the present, Flan is not much different from his future-self, still retaining his mocking and straightforward behavior to others. However, he still shows childish behavior, normal for a boy his age, such as when he mistook Mukuro and Varia as fairies, showing his childish imagination, or when he was scared upon his first meeting with Vendicare.
- Illusions - Flan, being Mukuro's disciple, is a powerful illusionist, capable of fooling a Fake Funeral Wreath, and is one of the three illusionists capable of fooling the Vendice.
- Bel Box Weapon - Flan has a Box Weapon that is a miniature version of Belphegor covered with Mist Flames.
- Hell Ring- Flan has the 666 Hell Ring.
- Reality Illusion Gloves - Gloves that allow Flan to make illusions into real, solid objects.
- In the Reborn! Fandom, his number is either 666 or 26.
- On official Reborn! products, his name is spelled "Fran."
- In the future, he was abducted by Squalo and Bel to join Varia.
- In the DS Games, his Box Weapon is shown to be a big grey toad, exactly like his hat, but in the manga and anime series, it is a miniature Bel that can breath Mist Flames.
- Flan's frog hat shrinks and wrinkles when his Dying Will Flames are being sucked away.
- He is forced by Bel to wear a frog hat that symbolizes he is Mammon's replacement.
- In the most recent poll, Flan ranked 4th in popularity and 11th in strength.
- Flan's character song is Special Illusion.
- In the "Dream Match-Up" Polls, Reborn stated that Flan is a genius, like Belphegor.
- Like M.M, he is originated from France.
- In the anime, he once broke the fourth wall and directly spoke to the audience.
- In the manga, Future Fran's speech replaces certain Japanese words with anglicisms, the most common being how he is referring himself, replacing "boku" (僕, boku?), with its English equivalent, "me" (ミー, mī?).
- Openings Featured In: