Yin and Yang Series/Characters

Keroro Gunso fanfiction Yin And Yang by author jlucydaisuke is filled with so much characters that a separate page is necessary for all the tropes they have. Also, it's a good reference sheet for notable characters.

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Kirere

 * Artificial Alien: The result of Kururu splicing his and Giroro's genes together.
 * Berserk Button: Don't call her stupid.
 * Cheerful Child
 * The Creepy Yellow Guy and Gruff Red Guy's Cute Pink Daughter
 * Girlish Pigtails: Has these in her human form.
 * Has Two Daddies: Her genetic donors and parents, Kururu and Giroro.
 * Oblivious to Love: Completely clueless to Tororo's massive crush on her.
 * Tyke Bomb: Created to be this, but turned out to be a failure.
 * Wrench Wench

Romama

 * Bishounen
 * Eyes of Gold
 * Hellish Pupils: He's got slitted pupils. Makes for very effective glares.
 * Hidden Heart of Gold
 * It's All My Fault: Much guilt, for being indirectly responsible for crashing the platoon onto Earth, and for letting Nikolai have too much power and turned into a Complete Monster.
 * Majorly Awesome: Was a Major when he was in the military.
 * Real Men Wear Pink: Romama is a vegan, does ballet, and loves cute animals. He's also known as the 'Demon Major' and will kick your ass if you get on his nerves.
 * Silent Snarker: When he was mute due to physical and mental trauma, and recovering.
 * Teen Genius: His fighting prowess.
 * Windows of the Soul: Dororo can understand what he's thinking by the look of his eyes, and thus his interpreter when he was mute.
 * Wise Beyond Their Years: Pretty mature, especially when compared to the rest of the cast...
 * Wooden Katanas Are Even Better: Ties with Dororo, who uses a real, steel katana, using a wooden one.

Chunini

 * Affably Evil: Manipulates people with a cheerful smile on her face.
 * The Hedonist
 * Hidden Depths
 * Lipstick Lesbian
 * Odango Hair: Well, they aren't hair buns, but buns nevertheless.

Lupapa

 * Blade on a Stick: Her weapon
 * Green Eyes
 * Kuudere: Type 2. Cold and aloof on the surface, warm and kind once you get to know her, goes dere for Dororo.

Fujuju

 * Adorkable
 * Badass Bookworm: Extremely intelligent, loves a good book, and can bomb you to pieces.
 * Child Prodigy: He was one.
 * Mistaken for Gay: Due to his soft and gentle manner. People were surprised when they found out his date was female.
 * Pyromaniac
 * Technicolor Eyes: His swirly Green Eyes.

Rokiki

 * Character Development
 * He's Back: After turning into an alcoholic and almost resigning himself to a loveless marriage, Rokiki takes a break to go on a journey to look for answers to his life. When he comes back, he's enters with a bang and back to his badass self.
 * Dark-Skinned Redhead: His human form.
 * Dark and Troubled Past
 * Drowning My Sorrows: Took to drinking as a coping mechanism to being stranded on 20th century Earth, and past issues. He got better eventually.
 * I Need a Freaking Drink: This a lot.
 * Jerkass Woobie: Your mileage may vary, but Rokiki is pretty much this after his Heel Face Turn. At least until he goes out for his journey of self-discovery...
 * Last of His Kind: Subverted. Rokiki first appeared as the last member of the Sankaku Tribe, only to discover that survivors remain scattered throughout the universe, and he's got a few descendants right here with him...
 * Purple Eyes

Haruki Suzuyama

 * Adult Child: Being around Kirere doesn't help this.
 * Only Sane Man: Compared to everyone else...yes.
 * The Slacker
 * Secretly Wealthy: He's the heir to a large business and fortune, yet lives as a simple bill-dodging mechanic.
 * Unfazed Everyman

Nikolai Kezanstav

 * Blond Guys Are Evil
 * Blue Eyes
 * Redemption Equals Death: Kills himself to do so.
 * Used to Be a Sweet Kid

Botan

 * Defrosting Ice Queen: After meeting the Keroro Platoon and dating Fujuju
 * Emotionless Girl
 * Last of Her Kind
 * Older Than They Look: Much, much older than she looks.
 * Shrouded in Myth
 * The Stoic
 * Time Abyss
 * Time Traveler
 * Timey-Wimey Ball: She's pretty much in charge of in charge of keeping it stable.
 * White Haired Beautiful Woman