- In Gone in a Flash, it is revealed that Kowalski has a crush on a dolphin named Doris, though according to Skipper, she just views him as a friend. ("She just likes you, she doesn't like you like you") & ("Reality to Kowalski, she's just not into you")
- In The Trouble With Jiggles, Skipper said-"Anyone whose last name doesn't end in -OWALSKI have any options [to stop the jiggli]?" It is thus shown that Kowalski is actually Kowalski's surname.
- Happy King Julien Day! reveals that he loves candy, possibly more so than the other penguins, as he dives into the piñata when it finally broke open to get at the candy inside.
- The episode The Hidden revealed that he has a hard time thinking on his feet. He doesn't listen to his gut because it is physically impossible.
- In I Was a Penguin Zombie, when they see Skipper acting crazy due to the side effects of a topical cream, Kowalski and the others believe that Skipper became a zombie. Kowalski assumes command until Skipper manages to pull himself together, but Kowalski tricks Skipper into believing him. In the end, Kowalski, Rico, and Private try to catch him, but they end up breaking their wings too.
- In Love Hurts, Skipper reveals that Kowalski has a tattoo of Doris the Dolphin. (We never find out where)
- In the commentary of the movies and in A Christmas Caper, he states his name, rank and serial number as: First Lt Kowalski, Serial Number 8-6-0-niner-bravo-alpha-mega-niner. (860-NBA-MN)
- Dentophobic (the fear of Dentists) -- At the end of Needle Point, it is revealed that he has an irrational fear of dentists, which is peculiar in that, as Private soon states after Kowalski runs off, penguins don't have teeth (All animals in zoos need oral checkups, though, so Kowalski's fear is still somewhat rational).
- His namesake is of Polish origins, and derivative of the word "kowal," meaning blacksmith, which are synonymous to (Nowak) with "Doe" or "Smith" in English-speaking countries. However, he and the others always technically mispronounce his name, since in Polish, the letter "W" is pronounced like the english "V", and the vowels sounds are a bit different.
- He also seems to have a slight temper, but not as temperamental as Skipper. (see Otter Gone Wild, Otter Things Have Happened, Jiggles, The Penguin Stays In the Picture, It's About Time...)
- He tends to say "Oh, Golly" / "Good Golly", similar to Johnny Bravo. They are both voiced by Jeff Bennett
- The first time Kowalski made a mistake and was slapped by Skipper is in The Hidden.
- He is jealous that the bad guys (like Dr. Blowhole) get the "good stuff".
- While Kowalski once claimed in All Choked Up that creating a shrink ray could take 712 years, by the time of the episode Jiggles, he had created a functioning one.
- In Operation: Cooties, Kowalski had to put a quarter in the show-off jar (because it must be implied that Skipper is annoyed that Kowalski keeps showing off his smarts to the other penguins).
- He is a very talented singer, and his voice is more on the Tenor side. He can also play the banjo well (regardless of his lack of fingers) The Return of the Revenge of Dr. Blowhole, Concrete Jungle Survival, Mental Hen.
- In Night and Dazed, he reveals that he's able to read lips (not very well, though).
- Kowalski usually explains things in a very complicated way (sometimes on purpose).
- He's so scientific, his "swears" are related to science ("Newton's knickers!!" "Einstein's undies",It's About Time) and "Galileo Galilei!!"(Needle Point).
- He seems to have learned how to read in later episodes, along with Private.
- Kowalski is prone to high-pitched screaming when he's in panic and nonsensical outbursts when he deals with a brain-related injury. (most notable in Mask of the Raccoon, Miracle on Ice)
- Once called Blowhole a "dolph-uh-in" as a response to "peng-you-in".
- Though he is Skipper's Lieutenant, it is shown that he isn't quite ready to lead the penguins as he relies on Skipper most of the time, panics a lot and is accident-prone. (see Snakehead!, Action Reaction, Pets Peeved, Command Crisis, Rock-A-Bye Birdie and The Return of the Revenge of Dr. Blowhole) Although, he had an alter-ego of himself called "Commander Kowalski" that seems more confident & better than his previous leadership ideas (P.E.L.T.)
- I Know Why the Caged Bird Goes Insane shows that due to his excitement, he scream so loud that glass broke.
- April Fools shows that he reads for a pass time (although it has been stated he can't read)
- In Maurice at Peace, Kowalski starts sneezing as soon as he enters the florist's shop, suggesting he may have hay fever or some allergic reaction to plants or just general allergies caused by the pollen & dust.
- Kowalski is a deep sleeper even Julien's antics couldn't wake him up as seen in The Helmet & Operation: Break-Speare as he doesn't seem to be suffering the detrimental effects of the severe degree of insomnia Skipper experienced.
- In Loathe at First Sight, it said that Doris gave Kowalski the "let's just be friends" talk 16 and a half times but he couldn't hear the rest because he was sobbing.
- Upon being loyal to Skipper as a recruit, Kowalski has disobeyed him twice, one in Invention Intervention, where he built something after Skipper told him not to invent anymore, the other in The Trouble With Jiggles where he is found out for not destroying Jiggles.
- In Our Man in Grrfurjiclestan, he can do a great impression of the Red Squirrel.
- He can be a little violent sometimes. Like in The Trouble With Jiggles, where he thought the children were eating the jiggli (they were really eating jello cubes) and was about to shoot them with a laser.
- Kowalski's way to relax is "pushing the untested boundaries of science". Action Reaction.
- Kowalski fears head injuries due to harm coming to his precious intellect when not in headgear. Noted in Byte Sized where he cries "NOT IN THE BRAIN!" while trying escape a fish slapping from Skipper and, in Rock-a-bye Birdie, where he is hit by a bowling pin and responsed "I'm ok, it's a non-brain injury."
- He carries around a wombat brain & in Misfortune Cookie when he says that he doesn't know how swapping Rico's brain with it would help, Kowalski says: "Oh, I've got to do something with this." and holds up a jar with the brain in it.
- Kowalski has a tendency to dismiss everything that goes against science, even when their's strong evidence he's wrong, he still refuses to believe it. Several Occasions include: Wishful Thinking, where he rudely rebukes Private's belief in magic, in Driven to the Brink, where he refuses to believe the car is haunted, even when he has no other explanations, and in Mental Hen, where he refuses to believe in Psychic Powers, even when evidence strongly pointed to its existence. Strangely, on two of these occasions, he proved to be right, as they were either accidents (Driven to the Brink), and the result of flawless study(Mental Hen).
- Kowalski complements himself in front of a mirror when nobody is watching.
- Kowalski desperately wants to be a leader and it is suggested that he thinks that Skipper is a 'dunder-brained boob'.P.E.L.T., Whispers and Coups, Snakehead!
- Kowalski has a widow's peak, which is where his black feathers form a V shape on his forehead.
- He does not like peanut butter ( Brain Drain, Loathe at First Sight )
- What doesn't make sense is it is revealed that he doesn't like broccoli The Penguin Who Loved Me but he mentioned something about how he "went all in on the broccoli for lunch" Operation: Cooties.
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