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菱川 六花 Hishikawa Rikka
|Season||Doki Doki! Pretty Cure|
|Eye Color||Dark Blue(Rikka)|
|Hair Color||Navy (Rikka)|
Blue (Cure Diamond)
|Home Place||Oogai City|
|Relatives||Hishikawa Ryoko (mother), Hishikawa Yuuzou (father)|
|Alter Ego||Cure Diamond|
|Theme Color||Blue (main)|
|Japanese Voice Actor||Kotobuki Minako|
|English Voice Actor||N/A|
Hishikawa Rikka (菱川 六花?) is one of the main Cures in Doki Doki! Pretty Cure. She is one of Mana's childhood friends and the secretary of Oogai First Middle School's student council. Her Cure Ego is Cure Diamond (キュアダイヤモンド Kyua Daiyamondo?).
Rikka has navy colored hair that is styled downwards with two side braids joining at the back and going down.Her eyes are dark blue. Her casual costume consists of old styled blue dress, which is where she wears her Cure Lovead, with light blue colored sleeves and dark blue colored ribbon on her neck. She has short royal blue socks and brown shoes. She is also sometimes seen wearing red glasses.
As Cure Diamond, she has blue hair and eyes. Her hairstyle might resemble Cure Aqua's, with curls at the end. Her top is long, like Cure Moonlight's, while the bottom resembles Moonlight's style but at Splash Star's skirt length. The costume overall is aqua, while the sleeves, skirt and inner lining are white. There is a blue ribbon with short ends on her right side, and a blue heart on the left side of her chest. Her sleeves are asymmetrical, with feathers only on the left side. She has simple golden bracelets on her wrists and neck. She wears short white boots with sharp toe tips. On her right side, hangs her Lovely Commune.
Rikka is a quiet, honest, blunt, not afraid to speak her mind and a very intelligent girl. She is a second year student at Oogai First Middle School, and the student council's secretary. She loves to study, and is a genius at it, being one of the Top 10 scorers in the national trial exams. She is great at observing people and situations. As noted by Mana in episode 9, Rikka is at the top of the class and constantly placed as the first place in her school, however her scores started to drop as she was in second place because of starting to play competitive karuta, as it was seen in episode 14.
Rikka is childhood friends with Mana, since they live near each other. Ever since they were children, Rikka has been taking on the responsibility of looking after the troublemaker Mana, sometimes being taken advantage of. Despite that, she also was always protected by Mana which makes Rikka trust her. She strives to lead a quiet school life, but is often dragged into various things by Mana.
Rikka is Mana's best friend and they have known each other since elementary school. She always tries to stop Mana from overdoing things but cannot seem to do so. Her mother works late at a local hospital and her father travels the world as an Archaeologist. Rikka finds out about Pretty Cure when Mana decides to tell her because it is hard for her to keep a secret from her best friend. She later runs into the mysterious merchant who gives her a Cure Lovead that she later decides to use to help her friend as Cure Diamond.
Aida Mana : Mana is one of Rikka's very close childhood friends and current schoolmate.
Yotsuba Alice : Alice is another one of Rikka's childhood friends, as they met in elementary school.
Kenzaki Makoto : Makoto is one of her Pretty Cure teammates.
Raquel : Raquel is Rikka's transformation partner who helps her tranform into Cure Diamond.
Hishikawa Ryoko : Rikka's mother, she appears as a doctor which always is late.
Hishikawa Yuuzou : Rikka's father, who appears as a professional photographer, and often travels a lot.
Aguri Madoka : She and other Cures met her during the battle with Regina.
Ira : Rikka has a different relationship with Ira then she does with the other selfish trio. She took him in and looked after him in episode 26 and went against Cure Ace to protect him, Ira has been teased by Marmo of having a crush on Cure Diamond, and he has also called her an 'Angel' in episode 26, whether he does have feelings for Rikka or not is unknown, although there are many hints to show that he does. In episode 32, Rikka gets upset that Ira has turned against her again and tells him to stop, he refuses though, which upsets her. However, she doesn't know that it's actually because he is under Bel's control with his life at risk because of the Blood Ring.
Eichi no Hikari! Kyua Daiyamondo!!
Cure Diamond (キュアダイヤモンド Kyua Daiyamondo?) is Rikka's Pretty Cure alter ego. She represents the light of wisdom.
Raquel cries out his name before Rikka first places her transformation Cure Lovead onto Raquel's silver heart medallion object and shouts "Pretty Cure Love Link!" She then spells "L-O-V-E" on her Lovely Commune and the transformation begins. She is seen floating around with her body, except for her head, glowing with blue light. First, her hair glows blue and grows into a long ponytail. Her hair then turns to a lighter blue and her hair accessories and diamond shaped earrings start to appear. Her dress then appears and her Lovely Commune attaches itself to it. Next is her heart brooch, bracelets and boots. Finally her dress ribbon appears on her pelvis and Cure Diamond poses saying her introduction speech.
Twinkle Diamond - is Cure Diamond's main attack, with the incantation "Sparkle! Twinkle Diamond!" (煌めきなさい！トゥインクルダイヤモンド！ "Kiramekinasai! Tuinkuru Daiyamondo!"?). Cure Diamond activates her attack with the Lovely Commune. It then blinks twice and she points her finger towards the foe, releasing a flurry of blue diamond-shaped energy beams. With this attack, she can also freeze enemies.
Diamond Shower - is Cure Diamond secondary individual attack that appear in Episode 11, firstly, she summon the Love Heart Arrow and set the Diamond Arrow Lovead within, then it shines, she take the arrow and she tap her arrow a couple of times releasing a big wave a diamonds.
Diamond Blizzard - is Cure Diamond's fourth individual attack. It looks like an upgraded version of Diamond Shower and Raquel says the incantation with her.
Power-UpsLike her Cure partners she can Power Up by herself when she takes it seriously in the battle, when this happens a blue light appear around her body.
Hishikawa (菱川?) : Hishi (菱) means "a diamond shape", while kawa (川) means "river".
Rikka (六花?) : The kanji Rikka (六花) means "snow". Individually, Ri (六) means "six" while ka (花) means "flower".
Rikka's voice actor, Kotobuki Minako, has participated in several image songs for the character she voices. Many of them include duets with Nabatame Hitomi, who voices Aida Mana, Fuchigami Mai, who voices Yotsuba Alice, and Miyamoto Kanako, who voices Kenzaki Makoto.
- Natsu no Ryuuseigun (Along with Nabatame Hitomi)
- Rikka is the twelfth Pretty Cure to be excellent in academics.
- She is the third Pretty Cure to have "kawa" in her last name. However, she is the only of the three who does not have a color in her family name.
- She is the first Pretty Cure to wear bracelets instead of arm warmers.
- She is the fifth Pretty Cure to have a long dress.
- She is the fourth Pretty Cure to have glasses. However, all of which do not wear glasses in their Cure form.
- However, neither Rikka and Tsubomi tend to wear glasses in their civilian form most of the time.
- Both Rikka and Tsubomi are not good at sports.
- She is the second Pretty Cure to have a diamond as her symbol.
- On Tumblr, Rikka is commonly known for a meme called "Rikka dancing", spawned from her being framed during a particularly silly part of Kono Sora no Mukou's choreography.
- She has some similarities with Kurumi Erika:
- Both of their theme color is blue.
- Both of them became Pretty Cure on the third episode.
- Both of their fathers are photographers.
- Both of them use water related powers when they are in Cure form. (Erika uses ocean powers, Rikka uses ice powers.)
- The two curled side braids in Cure Diamond's hair might represent dog ears, given that her mascot partner resembles a puppy.
- In episode 42, her star sign is revealed to be Virgo.
- Hishikawa Rikka/Cure Diamond is ranked as the 1st top anime character for December 2013 . 
- She has the most individual attacks out of the Doki Doki Cures, with four.
- Not counting the sub attacks from HeartCatch PreCure and sequel upgrades, she owns the most individual attacks.