Disclaimer: This post is partly a style guide for myself, and not all nicknames will be a 1-1 translation. I’ve included the romaji for your reference (excluding Rook’s list). This list is also incomplete.
Himself → Le chasseur d’amour
Trey → Chevalier des Roses
Jack → Monsieur Tough Guy
Ruggie → Monsieur Dandelion
Jade → Monsieur Mastermind
Floyd → Monsieur Kills for Thrills
Jamil → Monsieur Multi-Skilled
Vil → Roi du Poison, Beautiful Vil
Epel → Monsieur Cherry Apple
Malleus → Roi des Dragons
Silver → Monsieur Sleepyhead
Sebek → Monsieur Crocodile
Lilia → Monsieur Curiosity
Yuu → Little Shrimpy (Koebi-chan)
Grim → Baby Seal (Azarashi-chan)
Riddle → Little Goldfish (Kingyo-chan)
Deuce → Little Mackerel (Saba-chan)
Trey → Sea Turtle (Umigame-kun)
Cater → Sea Bream (Hanadai-kun)
Leona → Sea Lion (Todo-senpai)
Jack → Sea Urchin (Uni-chan)
Ruggie → Sharksucker (Kobanzame-chan)
Kalim → Sea Otter (Rakko-chan)
Jamil → Sea Snake (Umihebi-kun)
Vil → Betta Fish (Beta-chan-senpai)
Epel → Guppy (Guppy-chan)
Rook → Seagull (Umineko-kun)
Idia → Firefly Squid (Hotaru Ika-senpai)
Ortho → Sea Angel (Clione-chan)
Malleus → Sea Slug (Umiushi-senpai)
Silver → Jellyfish (Kurage-chan)
Sebek → Crocodile (Wani-chan)
Lilia → Flapjack Octopus (Mendako-chan)
Crewel → Beakfish (Ishidai-sensei)
Trein → Red Squid (Akaika-sensei)
Vargas → Lobster (Lobster-sensei)
Sam → Seahorse (Umiuma-kun)
Pomefiore 1st years → Fresh potatoes (Shin-jaga)
Epel → Baby potato (Ko-jaga)
Ace → Fresh potato 1 (Shin-jaga 1-gou)
Deuce → Fresh potato 2 (Shin-jaga 2-gou)
Sebek → Cucumber (Kyuuri)
Yuu → Herbivore (Soushoku doubutsu)
Riddle → Red Young Master (Akage no bocchan and Akai bocchan)
Azul → Octopunk (Tako-yarou)
Idia → Radish sprout (Kaiware daikon)
Malleus → Young Master (Obocchama), Lizard (Tokage), Monster (Bakemono)
Grim often refers to Yuu as his henchman. (Kobun)
Yuu’s nickname for Malleus is “Mr. Horns” (Tsuno Tarou)
Ace often teases Deuce by calling him “Mr. Goody-two-shoes” (Majime-kun)
Deuce refers to all his seniors by their last names.
Cater calls himself Cay-kun.
Cater adds “-chan” to all 1st years’ first names except Jack (-kun).
He calls Grim “Gri-chan” and Chenya “Chenyan”
Ortho refers to everyone by their full names
Exception is Idia, who he calls Big Brother.
Silver often calls Lilia “Father” / “old man” (Chichi / Oyaji-dono)
Sebek calls Malleus “Young Master” (Waka-sama)
Sebek tends to call everyone “Human” condescendingly (Ningen)
Lilia has referred to Sam as “Sammy boy” (Sam-bou)
Malleus described Yuu as “child of man” (Hito no ko)
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