kickyx
sigh i vote Yuanen Yehui since youre gonna be making the love interest a generic one ill atleast choose for the best one please dont choose gu yuena because choosing her just isnt the right choice her and tang wulin are quite literally made for eachother and i just dont want gu yuena to get with mc since it is just really weird i do think Yuanen Yehui is a really good fit that fits best with mc so i hope you choose Yuanen Yehui
I'd say if your not trying to add anymore sds stuff or characters into the douluo dalu word then I would do gu yuena since there interest allign but if your trying to maybe add a more sds feel into the story then yuanen yehui would make more sense since like you said she fits the role of drole can even change her up a bit to match even more