Yo

His main plan is to distract everyone and go in search of the wishing star to fulfill his wish to be the most powerful of all and finish them all off at once.

He hates feeling bad for others because of memories of the original him

He has powers that he uses through his hands; his hands glow with a transparent but bright yellow color when he uses them to move objects or other algebraliens. He can fly or float, although he doesn't usually do so. He can teleport to different places, although it's not an ability, but he usually uses a red cape with star-shaped shoulder pads to make himself invisible.

í is a yellow algebralien (letter) with lighter limbs. It's a lowercase "i" with an accent. It has some powers but isn't very powerful. It seeks more power to destroy everyone. It doesn't like to talk about its past (since Lamēd was killed and is dead, so it's a soul that possesses í). It often manipulates others, as it did with Ń (a capital letter with a wine-red accent), which it used to distract ü and eñe for its plans. Although it never treated Ń badly, it manipulated it, making it see that Ń was bad when it was the opposite (í often manipulates others to fulfill its plans). It also manipulated ü, inciting her to attack 4 and eñe with a book it gave her so she would go to 4's house (knowing that 4 hates letters). And also when ú was sad, it cheered her up with a notebook containing information about its plan.

i is just any letter, but it was possessed/manipulated by a Phoenician letter (lamēd) that now seeks to kidnap algebraliens (numbers in any case) for its plan to make them disappear by dividing them by Zero (another algebralien)

He has some friends and siblings; his friends would be ü and eñe, his siblings would be Á, é, ó and ú, showing himself kind to them in any case although being with Á makes him nervous; he also had a companionship with ñ

He usually presents himself as someone open to sharing his thoughts with others, always giving signs that he is good company and is not plotting anything bad about it (don't fall into his trap) although when you are alone with him (or he kidnaps you) he is a little more sinister and less compassionate (just don't make him angry at this point)