Difficult character to get right, this is the 3rd attempt at training. Main outfits work, but others are 50/50. Reference images to help prompting. Also careful using the word Nagatoro as it is a 'built-in' character to Illustrious, which is why the prompt is HayaseNaga_LW.

Below is a list of keywords used during the training of this model:
[187] HayaseNaga_LW, black hair, nagator_style, long hair, hair ornament, hairclip, brown eyes, dark-skinned female, dark skin, 
[187] 1girl
[183] solo
[181] black hair
[178] nagator_style
[165] long hair
[146] hair ornament
[143] hairclip
[139] brown eyes
[120] blush
[103] dark-skinned female
[89] shirt
[84] dark skin
[77] smile
[56] looking at viewer
[47] fang
[44] open mouth
[43] tan
[42] school uniform
[35] skin fang
[33] breasts
[30] swimsuit
[28] skirt
[21] white shirt
[21] earclip
[21] tanlines
[20] one-piece swimsuit
[20] competition swimsuit
[19] head out of frame
[17] sweat
[17] sky
[16] sweatdrop
[16] navel
[15] close-up
[15] frown
[15] closed eyes
[15] outdoors
[14] from behind
[12] portrait
[11] bag
[11] chalkboard
[11] blue skirt
[11] one eye closed
[11] day
[11] ponytail
[11] crop top turtleneck
[10] paw gloves
[10] small breasts
[10] fake animal ears
[9] smug
[9] nail polish
[9] bare shoulders
[9] gold trim
[9] bikini
[9] midriff
[8] sitting
[8] cleavage
[8] backpack
[8] cloud
[8] white bikini
[8] armpits
[8] black hairband
[8] sweater
[7] grin
[7] towel
[7] sports bra
[7] bike shorts
[7] crop top
[7] animal ear fluff
[7] jacket
[6] one-piece tan
[6] print shorts
[5] blue hair
[5] hand on hip
[5] crossed legs
[5] cat ears
[5] arms up
[4] no socks
[4] :d
[4] closed mouth
[4] medium breasts
[4] bookshelf
[4] profile
[4] meme
[4] green shirt
[4] looking back
[4] cat paws
[4] animal ears
[4] gloves
[4] cat tail
[4] ass
[3] arms behind back
[3] facing away
[3] window
[3] book
[3] indoors
[3] sleeves rolled up
[3] legs
[3] grass
[2] green backpack
[2] shoes
[2] looking to the side
[2] collarbone
[2] facing viewer
[2] drinking straw
[2] drinking
[2] smirk
[2] red nails
[2] towel on head
[2] upper body
[2] standing
[2] pointing
[2] on stomach
[2] lying
[2] bottle
[2] tree
[2] blue sky
[2] nude
[2] arm up
[2] school swimsuit
[2] simple background
[2] bench
[2] bush
[2] animal hands
[2] wide-eyed
[2] black gloves
[2] blazer
[2] socks
[2] pleated skirt
[2] hands on hips
[2] white one-piece swimsuit
[1] :<
[1] brown hair
[1] chair
[1] dress shirt
[1] crossed arms
[1] rain
[1] playing games
[1] holding controller
[1] barefoot
[1] couch
[1] uwabaki
[1] water bottle
[1] shiny skin
[1] beach
[1] back
[1] umbrella
[1] hand on own knee
[1] blue one-piece swimsuit
[1] bangs
[1] multiple girls
[1] 2girls
[1] clenched hands
[1] outstretched arms
[1] hand on own chin
[1] asymmetrical bangs
[1] collared shirt
[1] jewelry
[1] earrings
[1] fake animal ear fluff
[1] tail
[1] blue shoes
[1] stomach
[1] sparkle
[1] chopsticks
[1] food
[1] plate
[1] hat
[1] :3
[1] juice box
[1] school desk
[1] classroom
[1] desk
[1] piercing
[1] pants
[1] track suit
[1] index finger raised
[1] phone
[1] cellphone
[1] wavy mouth
[1] smartphone
[1] hair twirling
[1] doyagao
[1] kneehighs
[1] lower body
[1] easel
[1] shaded face
[1] hands on own knees
[1] stretching