Unfortunately, the stripe(s) on his shirts/kneehighs are a bit inconsistent between generations, so I'd suggest attempting to use very specific descriptions (ex: "white kneehighs with one black stripe") to achieve desired results, if not opting for inpaint. Otherwise, the rest of his overall design should be down to a T.
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Yuu Hazuki (葉月裕) from the series Natsuyasumi./ナツヤスミ.

Trigger words: yuu hazuki, dark-skinned male, brown hair, brown eyes
Yuu comes with two outfits:

• Outfit 1 tags: yuu_outfit1, red shirt, yellow wristband, green shorts, white kneehighs, blue sneakers

  • You can also add "mars symbol" tag that should appear on the back of his shirt if the picture is from behind

  • There's also a singular black stripe on his kneehighs if that matters to you

• Outfit 2 tags: yuu_outfit2, yellow tank top, green stripes, singular stripe, white short shorts, black kneehighs with two red stripes, blue sneakers

  • Same thing as the second sub-bullet point above, except the black kneehighs have two red stripes

Optional tags: short hair, hair between eyes, tanline, shorts tan

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• Recommended parameters: 20-25 steps, Euler a/Automatic (or DPM++ 2M/Karras)

• Upscaled with 4x-Ultrasharp; Adetailer also recommended!

• Add tags like "anime screenshot" or "anime coloring" to get results closer to the anime's art style!