(Scary Movie 3) Widening state trooper hat
(Spongebob Squarepants) Patchy the Pirate's hook and eyepatch are constantly alternating sides
(The Animal) Ever-tightening police shirt
(Brooklyn Nine-Nine) Rosa Diaz' changing hairstyles in the episode "The Crime Scene", courtesy of her girlfriend Jocelyn
Reinhardt (Overwatch)
King Dedede (Kirby)
Barrel (Amphibia)
Shadow Wizard Money Gang (@RE_Thinkin)
Jawas (Star Wars)
Lunatic Devotee (Terraria)
Zuko (ATLA)
Hester Shaw (Mortal Engines)
Chainsaw Man (Chainsaw Man)
Xenomorph (Alien)
Pirahna Plant (Mario)
It's fascinating to me that gladiator-specific armor and equipment was created, distinct from the stuff used for warfare. Gladiator armor was not only suited to an entirely different combat scenario (small duels versus fighting in formation), it was also designed for flash and spectacle, delighting a crowd of onlookers.
Visual clarity was emphasized to communicate posture or intent from a distance, and you can see that that expressed in the head ornamentation with the large frills. Not to mention it just looks so badass.
Shrinking Ray/Rae (Invincible) - male in the comics, female in the show. Extra points for unlocking unique scenes and a romance with Rex Splode. Lois Lane (My Adventures with Superman) - typically white in most media, Korean in MAwS. (You could also argue she's ginger in the Snyderverse, as opposed to her typically raven-black hair.) Nick Fury (Marvel, MCU) - initially white in the comics, which changed in the Ultimate Marvel Universe. Now, most people see him as Samuel L. Jackson.
I don't care if this counts as a character, I'm the moderator
Bandit Keith Howard (Yu-Gi-Oh)
Bass Armstrong (DOA V)
Guile (Street Fighter)
Stars and Stripes (MHA)
