I may or may not have been watching Book of Mario: Thousands of Doors and decided it’s headcanon time (except two are canon and the top row is questionable)
seen from United States

seen from Singapore
seen from China
seen from Kenya
seen from Iraq
seen from United States
seen from United States
seen from Japan
seen from United States

seen from United States
seen from Yemen

seen from Netherlands
seen from China

seen from United States
seen from Japan

seen from Australia
seen from United States
seen from United States
seen from Iran
seen from Moldova
I may or may not have been watching Book of Mario: Thousands of Doors and decided it’s headcanon time (except two are canon and the top row is questionable)
While Koopas do come in many colors, you don’t always fight them. The KP Koopas are a team of fighters in a tournament arc segment of the game that just happen to be yellow. I suppose the idea is that they’re golden and thus special, but the yellow is too close to their skintone and makes them look plainer than their red counterparts. Maybe if their punk wristbands were also gold, that would help.
Part 2 of the TTYD enemies that I’m drawing, notice the constant quality fluctuation. I really liked the koopas with sunglasses, that was a neat design choice that really made them look like “bad guys.”