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Considering that you have the Naruto tag, and how she gets things from her system. It could be interesting if she finds a summoning ritual in the library, a ritual that summons a desire. Morgan at this point would desire a rook, knight or queen candidate. Have her use the ritual and summon Izumi Uchiha on the night of the massacre(would be same age as current issei) (knight or queen candidate) Izumi should be easy ish to recruit if you address her trauma, also she awakens 3 tomoe during the massacre. You could also scale the sharringan to devil power. I.e medium rank= 3tomoe, high rank= mangekio, ultimate rank= eternal mangekio, Satan class= rinnegain, Super Devil class = rinne-rinnegain. Would also give a good way for mc to learn chakra, also koroka could teach Izumi sage arts. Another thing you could do with the summoning, is to summon someone from fate I.e artoria saber/lancer (knight candidate), scathach (queen candidate) Mashu Kryielight (rook candidate) and have the evil piece sever their connection to the throne of kings. But if you are strictly staying with dxd characters for the peerage, then grafia but it maybe hard as even if she is not married in this au she is likely still sirzechs queen, momo hanakai (pawn candidate), Ravel, phenex clan would likely trade her for benefits otherwise she would never have been given to Riser, as she would have to wait until she was a high class to be eligible to have the option of her own peerage again(pawn candidate), Tiamat because why not a 3rd dragon (rook or queen candidate)

Got Rias you have to include Akeno, especially due to Akeno’s personality of wanting things Rias is interested in. Save Izumi Uchiha, and add to harem, could be interesting to make her slightly yan (also AU it a bit by having the uchiha massacre happen a couple of years later, otherwise she will only be 13/14) (bishop/queen) Yue from Arifureta (bishop/queen) Hinata Hyūga, would be good, maybe plant the seeds on first visit when saving Izumi, (have time run faster in Naruto world so 10 or so years pass when MC comes for second visit) (rook) Momo from to love ru (bishop) Ayane (rook) and/or Kyoka (rook/knight) from dragons rioting Ena Seishuuin from campione (knight)

I thought he hadn’t done the last step with Erika yet

Loving the story so far, but I’m not sure about adding other Arthurian characters to the story

I like the idea, but I would make some changes, I think it would be a good idea to play off of Raphael’s name and artorias supposed powers as ‘holy’, so do castoria appearance (personally would like stage 2) with angel wings, and claim her to be Astoria’s guardian angel, this will give fury less headaches (no magical person he can’t track as she pops in and out of reality, as he will assume she is bound to artoria) and she can talk to her system without too many questions. It’s believable aswell as fury will eventually put the pieces together that Artoria is Arthur from legends (just not maybe his earth), he’s not the king of spies for nothing. Romance wise, remember that Artoria has memories from a time period where a king would have one official wife and it was common practice for kings to also have consorts.I know there isn’t a harem tag so you could probably get away with 1 or2 more interests before people start to complain (if you wanted to)

I’m good with Karin being the love interest, and from how you have written tenten I can see why she isn’t included. I can however see Hinata also being a love interest (add to karin or replace her) after the rescue arc, as Sakura and Karin have no connection to her unlike neji and tenten (hinata could believe neji was sent by the clan and tenten followed him to win his favour) hinata could also believe that Sakura has always been watching her due to sakuras use of Hyūga techniques. Then have Sakura and Ino make up where Sakura admits to being yuri (bs about loosing interest in Sasuke) and have hinata over hear or find out through ino. Whilst having hinata come to terms with the fact Naruto only sees her as a fellow ninja (well up until the fight with pain in canon) Relationship wise start it early shippoden but slow burn it to where ‘lemons’ (if you decide to write it or just fade to black) happens after the pain arc. Kids wise, this is Naruto, be creative with chakra techniques. Karin is yan and won’t want sasukes kids, and hinata is too devoted to people to want to have someone else’s kids, also for mc i think that would be way past their bottom line A relationship with both hinata and Karin would be easy to work in, Karin will see first hand Sakura save hinata and she could draw parallels to when she was saved. Hinata is so sweet she will worm her way into anyone’s heart including Karin, have a friend and rival relationship between the two until shippoden pain arc, then do the iconic scene where hinata saves a pinned Naruto from pain, but switch Naruto with Karin, then Karin shares her blood with an injured hinata (something you should keep strictly for mc up until this point to give the moment meaning), have the girls come away from the fight as seeing each other as sisters or maybe more 😉 And don’t forget ino does develop feelings for Naruto during shippoden (not sure it was during fillers tho) and backs off due to knowing hinatas feelings, so if there’s no hinata there’s a new pairing to play with

Agreed, but I hope the favour isn’t a straight up ‘give me Ravel’ but used to ask Ravel out or to free her from Risar’s peerage

Genjutsu should be super effective against Orochimaru due to the draw backs of him having an incomplete soul (he puts a bit of his soul into his curse marks for his reincarnation technique)

I suggest doing a mostly dom mc, maybe do some sub play with 1 or 2 of her paramours but keep mc as the only futa in her harem (doesn’t stop her from playing with futa outside it, just don’t get mc pregnant from outside as that would be awkward ). You can have the girls play with each other in the harem (not outside as you get NTR vibes) also do pov changes to some of the girls, if you want to write some sub content. If you want mc to be pregnant from a member of her harem, make it an expensive ritual s*x magic, it would help the reader believe her harem are not doing the ritual behind her back (reducing NTR vibes) Also I’m assuming it’s harem due to mc being a succubi, but if you want to write 1 love interest per partner lifetime (lifespan limitations) that’s cool too But in the end, it’s only suggestions, you should write what your comfortable with.

Agreed, the previous chapters were great, I find what separates authors on WebNovel is if they listen to the comments section, sure there will be some comments every now and again that disagree with the author but if the overall comments are neutral or positive then it’s fine. But if there are a lot of comments disagreeing with the author and it doesn’t change that’s bad. The author has shown that they are a good author by listening to the comments, but even though I say that the author must not forget that it’s their story, sure take suggestions but keep to your own vision as much as possible