Curate, connect, and discover
Warning: this post is kinda long
one thing I like about the Slug It Out games is they introduce some pretty cool original characters but since I'm pretty sure Spirex is the only one that became canon, here are some other ones I think deserve more attention (side note I will be sticking to the ones in SIO1 because their images are on the fandom wiki)
First is Minotaurus, my personal favourite who is introduced alongside Turtleton and Spirex (the names make it pretty clear which one is which) in the creature feature level of the judgement day chapter (basically just a cooler version of Mission: Improbable) where they work as a trio of hired mercenaries. Minotaurus has since been added as a SIO2 skin but the other 2 have not.
Next is Hudu Vudu, who is introduced in the first level of the same chapter (titled tricked) and is the one to capture Eli and bring him to Stalagmite 17. and is apparently Mr. Saturday's henchman. He has also been added as an SIO2 skin.
Up next is Doom Bot. It's a really cool robot not much else to say (there is also a Doom Bot 2.0 which is all black and has the Blakk Industries logo instead of an hourglass but the wiki doesn't have a picture of them). Like many of the others they have been added as a SIO2 skin.
Last and largest is Commander Croc. He appears in the second last level of the Ships Ahoy chapter (titled The Docks) where he attempts to stop Eli from getting some treasure. He makes a return is SIO2 with 3 smaller crocodile characters named Broc, Roc, and Smoc.
Slugterra sure loves to make cool characters and do nothing with them but that just means that since these guys aren't technically canon we can do whatever we want with them. Want to make one of them your oc? Go for it! Nobody can stop you >:D!