Just popping on to mention how much love I put into this character - As the OP mentions, it's been in development since before I started on WannaKOF, and I put in a lot of features into this character because Terry is one of my favorite fighting game characters, and I wanted it to be the most robust character he can be.

Some of the work I put into Terrance includes:
●Custom sprites for select normals, specials, and supers. From minor detail tweaks, to full on new sprites.
 HK, Command MP/HP, Air HP, Taunt Walk, Double or Nothing, Air Buster Wolf, Buster Vacation are some but not all of the examples.
●Making new moves like follow-ups to Rising Tackle, a guard-breaking move called Bongo Buckshot, An Air Buster Wolf - moves that (I feel) would be at right at home home with an official Terry moveset.
●A lot of subsystems and maneuvers like Fatal Fury-like Lane swapping, CVS2-like Roll Cancelling, Just Defending, Alpha counters, A max-mode like overheat system, airdodging, air throws, An assist-like system baked into Power Wave, variant supers, that funny C O U N T E R thing from Strive (Though that last one is more just a visual effect and tacked on extra damage as the KOFXV CD-like wallsplat already in the move is more than sufficient reward for hitting it)
●Tag team supers with WannaKOF and Buster in Simul. While I may not be the first to do this, nor is Terrance my first character packing a tag team super, I still wanted to point this out in case it hasn't been discovered yet.
●Special Intros against a lot of characters, like, a lot of them. A special winpose vs Yamazaki (that hopes he's in a specific pose when KO'd), and even a special interaction with Ray McDougal of all people
●An overhaul to my scaling AI, basically having coded 3 entirely different AI Levels based on the difficulty setting in MUGEN.
●Supers that do different things (visually) when used on Geese, namely Hungry Hunter Buster Wolf and Are You Okay?
●My usual fare, like prolonged idle pose, special animations upon getting KO'd and losing the match, cinematic-like high level supers, and a special mode for selecting Terrance while holding start.

I may have even forgotten a few things in this list, but I put a lot of care and attention into the development of this character, and wanted to make more than "just a joke character" - I hope that shines through when you play him (or watch or however you prefer to enjoy MUGEN). That said, I know a simple laundry list of bells and whistles doesn't really show the love I put into the character, and I implore you to explore this character for yourself to see what I've done.

And for those who have already seen Terrance and have given me good feedback - Thank you so much for enjoying this character and for giving these years I spent on working on Terrance meaning.