Cardinal, historically known as  Sapphire , was one of the splinters of the Irrational Sequence alongside Sequence, Fuzzy, Ivisyre. He was a quiet, reserved, and shy person, and typically stayed not only out of trouble, but out of everything in general. He often struggled to socialize, and was quite awkward in conversation. Out of the four splinters of the Irrational Sequence, he received the least of anything, causing him to be a bit dull. Except for creativity and artistry though, which he had an abundance of and was consequentially quite fabulous at painting.

Cardinal, despite the color suggested by his name, was very blue. His hair was relatively short, reaching almost to his shoulders, and was a dark, slightly dusty navy blue color. His skin was of a medium chestnut color, and he had freckles similar to Fuzzy along with a pair of round spectacles over his ocean-blue eyes. He was quite tall, standing over a head taller than even Sequence, and usually wore a grey hoodie with jeans. He was relatively close with Sequence and Fuzzy, seeing them both like family, though was in constant, yet silent fear of Ivisyre. While Sequence granted them second, third, and fourth chances when they did awful things, Cardinal always advised against it, seeing the permanent evil in them from the start.

Cardinal was originally part of the Irrational Sequence, retaining very little attributes or power upon the being's division. He was, however, blessed with artistry, and he frequently painted and drew things. After the Irrational Sequence was splintered, he stayed with Fuzzy and Sequence for a while, often watching over Fuzzy while Sequence was unavailable. Eventually, he decided to go off on his own to a distant fiber of the Thread. It's unknown what he did, as he hasn't spoken about it, but he returned to being on the main fibers when he was summoned by Sequence on page 1819, his help and power employed by Sequence in a desperate effort to resurrect the Narrator Thaidakar. He did very little for a while, occasionally showing up to complete minor tasks or have small conversations. As Sequence's celebration of the 3,000th page grew near, Cardinal was employed to help Sequence construct the cabin in which the party took place, and later, helped greet guests and serve refreshments. Most notably, he was forced to subtly spread a dark, toxic material produced by Ivisyre around the party. The plot was revealed when one of the guests, a woman by the name of Beosta, noticed the toxic material and alerted Sequence. Brought in for questioning, Cardinal quickly confessed to what happened, and the party was quickly ended and the guests were sent home for their own safety. As Ivisyre shrouded Sequence's World in darkness and sickness, Cardinal very quickly fell gravely ill, and soon after perished. He was buried by the lake on Sequence's World, though after Ivisyre took over the planet, the status of Cardinal's grave is unknown.