I

I is a letter who likes to be with his friends as shown in .‌nZ... and 3. However, they can sometimes be acting before thinking such as the time they beat f up for spelling "frick" on accident. (Changed) i did not appear much as lowercase. They were having fun with f, r, e, n, d, and s until o and l showed up. They then escaped in fear. They reappeared again when l pushed f into letters to make them spell "frick". Along with r, c and k. They were angry at f and stomped on him. This would explain why F stomped on i before kidnapping them. As an adult (possibly), i was kidnapped by F. Super N (Ñ) attempted to save them, but failed. i appeared in Number Lore dancing with A, E, O and U, when the Calculator Ship passed over them, leaving B behind, when the vowels notice X kidnapped inside one of the Calculator Ship's pods, making them angry but then, L passes through O's hole and they transform, chasing after the Calculator Ship.

i then formed the word "BIKE" with B, K and E, leaving A and U behind.

After Z, with his moons, makes the Calculator Ship crash, they are seen de-transforming and standing with E, K, B, L, O, N, A, V, T and g, witnessing number Three's creation and the battle. They also witnessed L and O defeat the numbers, with L shaking out the ship's continents and X, then he throws the ship to F's cave while O conjoins the numbers with his colon gem.

In episode 4, I witnesses VAN traveling to F's cave, and while they and the others weren't looking, One broke the colon gem with his blowtorch, then the numbers reform the Math Machine while using Two as a horse and they run over the letters.

Later in the episode, BIKE reforms and they chase the numbers while witnessing g Jr messing with the equator wheel and 3 with 1's clone makes a "bootleg" 2. When g falls off, BIKE catches him into the basket carrying K's moth eggs, thus giving the numbers a chance to make 4. She dives to the ground and extends her tail to provide faster travel while carrying the numbers, much to 2's surprise. 4 makes a roadblock with her tail and this results in BIKE's front wheel popping. However, O saves the letters and replaces the front wheel with himself, allowing the letters to catch up to the numbers.

After BIKE, g, and O see the ampersand gem broken, O detaches himself from BIKE and conjoins the semicolon and question mark gems while BIKE lands in F's cave. The numbers find the ship being hijacked, and 4 makes roots in the ground to boost her and the numbers' way up, then she uses her tendrils to restrain the ship, showing the first time the numbers and letters work together. But disaster strikes again when O's gem's powers fade out (due to 1 braking it and weakening it, or the ship's heavyweight status with 4 also restraining it), causing the ship to fly to Planet 0 with F, g Jr., and a still-stuck L. BIKE watches as N and O are in grief when they lose their best friends. In 5, After 5 bodyslams G to the ground, I alongside E feel the loud noise the slam made. Later in the episode, I picks up Clone 1's device and equips it. I follows B, E, K and her eggs, and O. I and the other letters then witness N turn emo after stepping on the Question mark gem. As the Numbers turn F's cave into a castle, I then witnesses 4's long tail come inside F's cave. Then, I and E see the 5 clones rain down in front of them. They then reform BIKE alongside B and K and they then leave F's cave alongside N, O, and K's moth eggs. As they drive away from the cave, they pick up letters such as V, A, U, W, C, and J. The clones chase the Letters as they try to pick up H but are unable because H is a ghost and then the BIKE speeds off while the clones of Five trample them. T reintroduces himself, but the Letters almost run over him again, and he looks at the chaos before joining the chase. T makes a hole for the Letters to go into as BIKE speeds up. A clone of Five almost bites J's chin, but he is saved by C. The Letters fall underground as T seals up the hole as the clones stampeded through. After T saves M and Y, T leads the group to his bunker, where he shouts for any intruders present in his bunker.