Seislain

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Flainsmo is the HET ship between Flain and Seismo from the Mixels fandom.

Canon
Flain and Seismo are both friends with each other, and Flain calls Seismo as one of his "campadres", as he does with his other friends.

In "Nixels", Flain and Seismo create a lava slide at the Infernite Kingdom, but when they are about to ride it, a Nixel comes in and tries to ruin their fun. Soon, a lot more of them invade as well. Flain suggests that he and Seismo Mix so they can repel the little creatures away, and so they do so after retrieving back their Cubit from them and fight off the thousands of trash-talking Nixels. After they defeat the Nixels, they upgrade their lava slide in the process; but the same Nixel from the beginning comes back to annoy them again. This time, Seismo stomps on it and it gets stuck on the bottom of his foot. He then leaves with Flain to try out their improved lava slide, while the flattened Nixel angrily chants.

So far, "Nixels" is the only episode where they have interactions, as the Mixels franchise was discontinued in 2016. However, if the show is ever revived in the future, we could see future interactions between the two characters.

Fanon
Although this ship isn't very much supported as other mixel shippings, it does have it's fair share of fans that support it, even though like this ship, isn't canon due to Mixels not tackling romance nor shipping in the series.