White_Clown
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suggest for other visualization. Since the spirit is plant-type, image the body as soil and spirit power as feltilizer or water for the plant. "The concept is nurturing the plant".
actually, the biggest problem that MC will meet is Ziyun. This is just my opinion, if Shen Yue transmigrated since he's young, he can lead the engagement with Xiao Ning'er instead. Let's see, something like ask to his parents earlier (chose Winged Dragon Clan first before being betrothed to Snow Wind Family). So, the plot is switch the engagement partner. Shen Fei will become living sacrifice because his fiancee is Ziyun. So he will againts the regressor (Nie Li) while MC won't get any problem.
make him to get Sacred Gear. my suggest is [Mastema], Teigu in Akame Ga Kill!. having some power is still acceptable if MC will involve in canon's conflict. Also, normal sacred gear is still common in series's character. my suggest harem is Asia, Irina, Xenovia. And they'll still human, or maybe all of them become angel later. [Asia and Xenovia join in Heaven faction like Irina]
Hide in his shadow, Megumi can do it in canon. Also, make him to move around inside his shadow. Use Mirio's tactic [Hero Academia]
the solution is ask his parents. Great Clan's innate technique is famous that strength and weakness be known to jujutsu society. Also they're from those family, so they're know too many about it than others. And do he knows about binding vow in this time?