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A
- Amnesia Episode: In one episode, she forgets her name and can only remember it when she's with Y, I, or E.
- Butt-Monkey: She falls over, always wears a band-aid, and has apples falling on her head.
- Hiccup Hijinks: In "Name", A gets the hiccups and can't say her own name.
- The Klutz: She's often falling over, tripping, etc.
- Plot Allergy: She's allergic to cats.
B
- Character Catchphrase: "B on bass!"
- My Nayme Is: Bea is a girl's name pronounced the same as her name, but her name is just B.
- Scatting: She always says, "buh buh buh" while playing the bass.
C
C notably has a superpower besides "you-know-what": she has the power to crack things, which she likes to show off (possibly the reason for her always having a crack in her "letter cage"). She also has a rivalry with her brother K because they make the same sound.
- Action Girl: She has powerful stamina, superpowers, and an outfit that looks like an athlete's.
D
- Character Catchphrase: "D on drums!"
- Scatting: Similar to B, he says, "duh duh duh" while drumming.
E
- Highly-Visible Ninja: While being silent, he wears a ninja suit but doesn't otherwise act stealthy.
- "I Am" Song: He has two:
- In one song, he sings about being the busiest letter.
- In the other song, he sings about his power to change letter sounds into their names.
- Large Ham: Tends to shout through a megaphone.
F
- Flight: She can fly by blowing.
G
- Bizarre Alien Biology: She has grass growing on her head, and she's technically an alien since the Alphablocks live on another planet.
- Character Catchphrase: "Good grief!" and "Gosh!"
- Drink-Based Characterization: Her drinking water is related to the idea of watering plants, since it helps her grass hair grow.
- Nature Lover: She's often seen gardening when not tending to her grass hair.
- Plant Person: She grows grass instead of hair, but she still calls it hair.
H
- Character Catchphrase: "Hooray!"
- Lovable Jock: Is athletic, but she's not a Jerk Jock.
I
- Character Catchphrase: "I know!"
- Hidden Depths: Seems like a stereotypical vain, prissy woman, but she may also be somewhat of a rocker if her being the singer in Din is anything to go by.
- Jerk with a Heart of Gold: She's arrogant, but is still on good terms with everyone.
- Know-Nothing Know-It-All: Brags about being "intelligent" and often claims she knows, but she hardly ever has the knowledge she claims to and, while not dumb, isn't any smarter than the others.
- Large Ham: Shouts a lot, boasts a lot, and tends to sing her sound instead of saying it while spelling.
- Lovable Alpha Bitch: Although the word “bitch” wouldn’t actually be used, she is definitely this trope. Also a bit of an exaggeration in that she doesn’t seem very bitchy to the other Alphablocks at all; see Jerk with a Heart of Gold above.
J
- Character Catchphrase: "I'm a jolly jaybird!", "I can fly!", and "Jumping jellyblocks!"
- Cloud Cuckoolander: She thinks she's a bird.
- Hollywood Tone-Deaf: She absolutely cannot sing (at least, not the way she usually does by making her sound. She can sing songs with actual lyrics just fine.)
K
- Character Catchphrase: "OK!"
- Lovable Jock: Is athletic and, while he does argue with C, he's still far from mean.
L
- Beautiful Singing Voice: Her lullabies are pretty popular.
M
Seeing as people say, "Mmm" when they're hungry, and that "munch" begins with M, M's shtick is that he's always hungry— and he doesn't limit himself to food items.
- Big Eater: There was only one occasion in the whole series when he wasn't hungry.
- Character Catchphrase: “Mmmmm!”
- Extreme Omnivore: He sometimes eats non-food items, including bits of the ground and blackboards.
- Good with Numbers: Is the only one who knows the answer to 7+1 out of him, S, and U. It's eight, but they thought he was saying he ate the blackboard.
- The Pirates Who Don't Do Anything: Wears chef clothes but never cooks.
N
- Aesop Amnesia: In "Little Red N", N learns to say 'yes' sometimes, and to not be so negative. However, by the next episode, he goes back to saying 'no' to everything.
- By "No", I Mean "Yes": N does not like saying 'yes', so he says 'no' in a lot of situations where he clearly means 'yes'.
- Character Catchphrase: Says, "No!" a lot.
- Not So Above It All: Usually acts like a grumpy sourpuss, but when he's with F and U (spelling out fun) he goofs off.
- Scatting: Like B and D, he sings his sound while playing music, in his case his clear guitar.
O
- Character Catchphrase: His letter sound… it’s all he ever says.
- Intelligible Unintelligible: Everyone knows what he's saying despite his being only able to say his sound.
- The Noseless: O doesn't have a nose, though everyone else does.
- Pokémon Speak: O only ever says 'oh'.
- Ridiculously Cute Critter: Anyone looking at him would agree.
P
- Character Catchphrase: "I just popped in!"
- Flashy Teleportation: She can teleport willingly, but noisily, with a popping sound.
Q
Because Q can barely spell anything without U, he finds her a bit annoying, but she's actually very sweet. She doesn't say much.
- Abhorrent Admirer: She's not really attractive and she is very overbearing towards U.
- Dirty Old Woman: Implied. Judging by the way her face looks and her puffy hair, she’s likely an elderly woman, as opposed to U who looks like a schoolkid.
- May–December Romance: Played for Laughs. She wants one with U, but he’ll have none of it, thank you.
R
- Character Catchphrase: “Rrrrrrrrrrrrrr!”
- Dressed to Plunder: She wears a pirate hat and eye patch.
- Eyepatch of Power: She seems to be able to see perfectly fine despite her eye patch.
- Friendly Pirate: R is a pirate who is very good friends with the other Alphablocks and sometimes even helps them. She's not seen doing pirate things usually, but in one episode, she does dig up buried treasure.
- Pirate: Acts like a stereotypical pirate and is occasionally seen searching for buried treasure.
- Shown Their Work: R has two eyes, just like real life pirates whose eyepatches were used to see in the dark.
- Taking It Well: In the Halloween special, when her pirate getup is mistaken as a costume, she just says “Rrr, costume? I didn’t realize it was a costume party!”
- Talk Like a Pirate: Says, "Rrr" and addresses her friends as "shipmates".
- Tomboy and Girly Girl: She is the tomboy to I’s girly girl.
S
- Flight: If she puffs herself up enough, she can fly.
T
- Birthday Episode: He had his birthday in the episode where they fall into a trap (though we never found out how old he was).
- Brits Love Tea: He drinks lots of tea and he, like everyone on this show, sounds British.
- Character Catchphrase: "Anyone for tea?", "Total tomfoolery!", and "Time for you-know-what!"
- Hammerspace: T often pulls out a teapot and teacups from behind his back, though the teapot doesn't always have tea in it. E does the same with his megaphone, and I with her mirror.
- Quintessential British Gentleman: T has a bowler hat, monocle and moustache, and likes to drink tea.
U
- Born Unlucky: He’s often unlucky just like the letter he’s based off of.
- The Eeyore: He's often in a bad mood.
- May–December Romance: Dead set on averting this.
- Nerd Glasses: He wears these glasses to show that he's a dork/loser.
- No Guy Wants to Be Chased: He is strongly averse to Q's advances towards him.
- Not So Above It All: Is usually one of the less goofy letters, but likes to goof off when he's between F and N.
- Sensitive Guy and Manly Man: Sensitive guy to X’s manly man.
V
- Red Ones Go Faster: He's red and speedy.
- Super-Speed: Is extraordinarily fast.
W
- Character Catchphrase: “Wow” and “Whoops.” His loud wailing cry is also one.
- Prone to Tears: His main shtick is that he cries easily.
- Ridiculously Cute Critter: Particularly When He Smiles.
X
A superhero who calls himself the Exciting X, who often appears out of nowhere to solve problems. He lives underground.
- Flight: He can fly.
- Flying Brick: He can fly, and he once describes himself as "stronger than an ox".
- Good Samaritan: Whenever he comes on the scene, it's usually to help someone.
- Sensitive Guy and Manly Man: The manly man to U’s sensitive guy.
- Spell My Name with a "The": Calls himself The Exciting X.
- Superheroes Wear Capes: He wears a red cape.
- X-Ray Vision: His signature ability.
Y
- Baby Of The Bunch: is the only one explicitly referred to as young by his official profile, and certainly looks like a baby.
- Character Catchphrase: "Why?" and "Yikes!"
- Constantly Curious: He often wants to know why things are happening.
Z
- Baby Of The Bunch: Inverted. Z is the only character explicitly referred to as old by his profile, and he has what looks like a veteran badge.
- Character Catchphrase: "Alphablocks! Attention!"
- Catching Some Z's: Whenever Z falls asleep, little Zs float out of his mouth. In "Zap", he zaps all of his Zs and has to get them back.
- Noodle Incident: We don't know how he won that medal he's always wearing. However, given his age it’s possibly a World War II veteran badge.
- Senior Sleep-Cycle: He's old and he tends to fall asleep.
- Shell-Shocked Veteran: Implied. He’s afraid of word magic, possibly suggesting it was used against him in the war.
- Vague Age: He's old. Not specified how old.
- Why Did It Have to Be Snakes?: As seen in “Dots,” he is afraid of word magic.
