This is a ever-growing, comprehensive list of everything that is Pretty Soldier Sailormoon. You can find all the terms, phrases, characters, and anything else you can think of that appears within the anime or is related to it. Links to available sections on the subject are provided.
Section I - J Listing Count: 35
I
Ibuki, Kengo
(First Appeared: Episode 183) Kengo is a ceramic artist and relative to Hino, Rei.
Ichinohashi Park
(First Appeared: Episode 181) This is the park where Usagi and Seiya met for their date.
Ichinose, Natsumi
(First Appeared: Episode 138) Natsumi is a widow and owner of a car garage.
Ichirou
(First Appeared: Episode 142) He is a famous chef who owns the French cuisine restaurant, "Three Stars."
Ijuuin, Sonoko
(First Appeared: Episode 187) Sonoko was the head of the Three Lights fan club, being member number 1.
Ikuko-mama
This is the nickname given to the mother of Tsukino, Usagi and Tsukino, Shingo by Chibi Usa.
Illusion of Pegasus
(First Appeared: Episode 134) Second book written by Takase, Tomoko and dedicated to Makoto.
Infinite Academy / Mugen Gakuen
This is the high school where Tenoh, Haruka and Kaioh, Michiru attend. The school is owned and run by Professor Tomoe, a scientist who secretly led the Death Busters.
Inner Senshi
A term commonly used in the Sailormoon Community, but NOT an official term used in the anime or manga. The term is non-specific as to whether it refers to the guardians of the Princess Serenity; Mercury, Mars, Jupiter, Venus; all five girls or all five girls plus Chibi Moon.
Iron Mouse, Sailor
(First Appeared: Episode 173) One of the Sailor Anima-mates who followed the orders of Galaxia.
Itabashi, Saki
(First Appeared: Episode 175) She is a camera woman assigned to take pictures of the Three Lights.
Itsuki, Arisu
(First Appeared: Episode 173) At a Three Lights filming in the park, the actress Itsuki was also there.
J
Jadeite
Janelyn
Jay Daito
Jet-black Mirror
Jewelry OSA*P
Jizel
Joe of the Crane
Jun Jun
Jupiter, Sailor
Jupiter Crystal Power! Make Up!
Jupiter Oak Evolution
Jupiter Power! Make Up!
Jupiter Star Power! Make Up!
Juubangai
Juuban Elementary School
Juuban High School
Juuban Mall Dream Road
Juuban Matsuri
Juuban Middle School
Juuban Odyessy Apartments
Juuban Second General Hospital
Juuban Shizen Koen
Juuban Shopping District
(First Appeared: Episode 001) The first of the Shitennou to appear and fight for Queen Beryl. He was put into an eternal sleep by Queen Beryl after too many failures.
(First Appeared: Episode 039) One of the famous ice-skaters turned youma. Her partner was Misha.
(First Appeared: Episode 003) Jadeite's disguise name that he used when he created the Midnight Zero radio show as a plan to steal energy through small flower brooches.
(First Appeared: Episode 167) This is Queen Nehellenia's mirror.
(First Appeared: Episode 001) A shop run by Osaka, Naru's mother.
(First Appeared: Episode 145) Ballet performed by Kiriko and Yamagishi-sensei.
(First Appeared: Episode 025) A Rainbow Crystal holder who was transformed into the youma Gesen.
(First Appeared: Episode 148) One of the Amazones Quartetto, the master of acrobatics.
(First Appeared: Episode 025) Soldier of the planet Jupiter. Kino, Makoto transforms into this Sailor Soldier.
(First Appeared: Episode 154) Makoto's third transformation that changed her into a super sailor form.
(First Appeared: Episode 154) Attack used by Sailor Jupiter in her super form.
(First Appeared: Episode 025) Makoto's first transformation phrase. This turned her into Sailor Jupiter.
(First Appeared: Episode 065) Makoto's second transformation phrase. This turned her into Sailor Jupiter.
A district in Minato-ku, Tokyo where Usagi and her friends live.
School where Chibi Usa goes when she is visiting the 20th Century.
School where Usagi, Ami, Makoto, and Minako attend in season five.
(First Appeared: Pretty Soldier Sailormoon SuperS Movie)
This is the place where the hypnotized children walked. It led them to the dream ship of the fairy Poupelin.
(First Appeared: Episode 103) Rei was on the committee that ran this summer festival in Juubangai.
School where Usagi, Ami, and Makoto attend in seasons one through four. 
(First Appeared: Episode 047) This is the apartment building that Al and En used as their hideout.
(First Appeared: Episode 115) This is the hospital where Mizuno, Ami's mother works as a doctor.
(First Appeared: Episode 112) The park where Chibi Usa met Tomoe, Hotaru. It is also the park where Eda, Yousaku was filming his western movie.
Usagi and her friends are seen many times in this area through the course of the anime.