Category 1 - Character with Pink Hair
Lightning Farron from Final Fantasy XIII (FFXIII)
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Reference:
vignette1.wikia.nocookie.net

Category 2 - Villains
Tier Harribel from Bleach
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Reference:
vignette1.wikia.nocookie.net

Category 3 - Non-Human Characters
Zidane Tribal from Final Fantasy IX (FFIX)
Male Doll was used
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Reference:
vignette3.wikia.nocookie.net

Category 4 - Yellow as main color (clothing, skin, or hair. As long as it's not subtly involved.)
Yang Xiao Long from RWBY
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Reference:
vignette1.wikia.nocookie.net

Category 5 - Video Game Characters
1st Entry
Setsuna from Fire Emblem Fates: Birthright
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Reference:
kantopia.files.wordpress.com

2nd Entry
Christie Monteiro from Tekken
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Reference:
vignette4.wikia.nocookie.net