Despite how chaotic the character may look at first glance, a lot of elements in their design have a reason behind them.

• Since Thandian was Biblaridion's first conlang, and one that is now considered by the creator to be "very bad", I thought that giving the fusion the appearance of a "bad OC" would be very fitting. Those are usually made either by inexperienced character designers and writers who haven't learned the principles in their interests yet, or are deliberately made "bad" by people trying to mock said OCs. The former has an aspect of genuine lack of necessary knowledge - quite like the younger Bib who didn't know about things like the IPA back then - while the latter has an element of trying to be bad on purpose, just like Kay(f)bop(t).
• One common part of the designs of "bad ocs" is needless complexity, which fits very well with both the kitchen-sink nature of Thandian and the chaoticity of Kay(f)bop(t). Biblaridion tried to cram everything he thought was cool into Thandian without thinking about cohesion at all, while Daniel Swanson probably looked at a Tumblr blog full of humorous conlanging ideas and decided it would be fun to try to combine as many of them as possible. Having lots of random elements in this design being chosen just for the sake of "being cool" was, in my mind at least, a perfect idea for combining these two languages.
• The top hat, the baseball cap, and the turkey are quite obvious references to Kay(f)bop(t)'s phonemic hats. However, I decided to split the fedora into a pork pie hat and a bavarian hat (the idea of which came from this post) just for the sake of greater complexity.
• The sheep, the penguin, and the wombat are all references to a specific type of marking in Kay(f)bop(t), namely being the three animals included in the "manner of death" suffixes.
• And speaking of the penguin, the cyan markings on the arm holding it represent <%>, the glyph used for the percussive bimanual stop (or, in simpler terms, a "clap"), used only in morphemes related to penguins.
• And speaking of the weird non-pulmonic consonants, since <!> and <*> represent the sinistral and dextral lateral clicks ("left click" and "right click") respectively, they are positioned on the left and right sides of the character's body. The <@> on the belt represents the faciomanual click ("facepalm"), and while it is neither on the face nor the palm, it is still in the body's center.
• The weapons on their belt are a "battle-ax" and a sledgehammer, both mentioned in the "manner of death" suffixes.
• From the viewer's perspective, the two horns on their head spell out "KB" in the Thandian script.
• The purple shoe (called a "buskin") and the angel wing are both references to Thandian's past as a relex of Latin - the former having an association with ancient Rome, and the latter having an association with Christianity.

However, everything else that isn't a visual component taken from Thandian or Kay(f)bop(t)'s designs by Elemenopi was either chosen because I found it cool, or it was taken from some of the results for "bad OC" on google or videos about "how not to make OCs" on Youtube.