Partial

His best friend would be Sigma, since he admires his free-spirited style and his hobby (skateboarding). Out of admiration, he even built a scooter himself. There's also Nabla, who's more like a companion to him, although her energy always interrupts his work, and his friend Psi, whom he sees from time to time.

Partial is a calm and friendly algebralien with a touch of mischief, passionate about mechanics and among other things, he is rarely seen angry, has an energetic personality and loves to help his friends

It's a yellow algebra alien with lighter limbs; its shape resembles the number 6 but upside down (i.e., turned the other way), although it's actually a cursive "d". It wears glasses with funny eyes (i.e., one facing up and the other down) that it made itself for fun.