XG has Tippy Toes, Mascara, Shooting Star, Left Right, GRL GVNG, TGIF, New Dance. They also have Tape (Raps) and Vox (Vocal) series. Then there's the BTS/VLOG type stuff in Xtra XG and XG Days. They have a Documentary called Xtra Xtra as well.
XG- 7 members aged 17-21. They are Japanese and trained for 5 years prior to debut, in Japan and Korea. They speak Japanese, Korean, and English. They are a Global Girl Group. They are like American Hip Hop/R&B, and Pop, but yet they also Rap in Korean, Japanese, and English.
Harvey is the rapper in Tippy Toes with the long nails and hair that was pulled back that you mentioned, but in New Dance the featured rapper was Maya. If you want to see the full 4 member rap line at a glance (what went viral first), check out XG Tape #2 GALZ ZYPHER. After watching all of their MVs I would also highly suggest you watch the Dance Practice videos for all their songs as well (the “fixed” version when more than one dance practice video is available for a song), just to see the dance crew level skills and swag. Then in addition to the Tape and Vox videos I would suggest watching the Move videos (Move #1, Move #2 for Cocona, JURIN and Maya in particular, and then Move #4 to a range of dance styles)
yep do a go through all of XG (Xtraordinary Girls) content, the sub label XGALX of AVEX this group is the creation of Simon Jakops a former K-pop Idol himself (DMTN), Pre and Post Debut content as follows the Vox vids are their Vocal line (the 3 of them), the Move vids are all of them individually and as a group with their dance, the Tape vids is the Rap line (all 4 of them), but just an FYI those above noted vids are tame compared to stuff they did in the Xtra Xtra documentary which is a deep dive on how they came to be and all the training they went through as well a never before take on the behind the scenes on the creation of these groups, keep in mind they have only been out just over a year currently have 7 songs out with the Mini Album dropping this month