Kaiser Shadow Hunter

Can you give a little hint in duel Shinobu with reiji, other then he uses all special summon method. What special card he Will use?

If shinobu is from the fusion dimension and since he doesn't seem to be from the academy you could make him be one of the people who was never interested in Leo's plans and you could make him an orphan considering Yuri and Serena being orphans and you could make that when he was little he used his royal paladin version with him having a Yugioh master with his Master using a Fallen Albaz Invoked Dogmatica deck until the peace was ruined because of the arrival of Leo who even defeated shinobu's master with dishonest tactics without using duels (Since let's face it the guy is so blinded by his goals to use mind control parasite on his daughters' fragments so using dishonest methods to beat someone in a duel is a possibility while avoiding that there are people who have seen it to avoid bad reputation to his cause) the reason why he doesn't participate in dimension war besides being very op and that the royal paladin was a starting deck for shinobu. and Drago.emp was when he got his master's recognition but shinobu keep royal paladin deck with him and that he joined Yusho to oppose the academy and that Yusho captivated some high ranking people of academy to defect and help him with things that are not duels for example creating cards and the travel of dimensions like xyz that shinobu use with the ritual deck asuka/alexis for this you could use Dr. Eisenstein from gx as a legacy character who worked with leo but seeing the true character of leo he decided to escape with the help of Yusho
          
          So the royal paladin deck is a fusion deck for the moment while Drago.emp deck has access to xyz monster and the reason why Shinobu does not mention anything about Yusho is because of his amnesia

I have an idea for the yugioh book about shinobu's past life before the story hope you like it:
          
          What if Shinobu was from the xyz dimension and friends with yuto and shay, and became a pro duelist and all that. Anyway during the invasion he joined the resistance, but was brainwashed and used as a exterminator extinguishing his former comrades, but during a fight with yuto ruri and shay he briefly gains control and tells them to finish him off which they do with Xyz rebellion dragon, lyrilusc - assembled nightingale and Raidraptor - Revolution Falcon. During the aftermath a building comes down on ruri, but shinobu comes to the rescue and gets crushed and presumed dead by the resistance and academia, but little did they know the collapse resulted in his transporter glitching and teleporting him to the standard dimension and do to the collapse it caused him to have amnesia.
          
          I feel like this makes sense due to his resolve and coldness from the war and his proficiency in xyz.
          

Is in the end of january you Will return?

I know it's bit late but Happy New Year! 

By the way, for the story of arc V and vrains, will the characters be anime, for example they never age, they never change clothes or will we see the MCs using different outfits in some arcs? Maybe shinobu could wear something similar to kai's outfit in the link joker arc
          While the mc vrains could have more clothes than the den school uniform maybe you could make that mc be from another school and transfer to yusaku's school for the second season to make the exchange of information easier
          
          Since you said that the mc ignis will be the ice ignis will that have some relation to miyu since hers is the water ignis or will it just be a coincidence so that miyu is a possible love interest for the mc maybe with them being childhood friends so the mc meets aoi with both miyu and mc being from a different school than yusaku and aoi to keep the plot so aoi doesn't know anything about miyu until the second season although they could have interacted in the first season with her link vrains avatar where in the second season you could have lightning use dirty mind control tricks to put a blue girl with new trickstar support vs Miyu and her marincess deck and specter vs revolver

R/P Thing Saver Dragon
          Attribute: Light Type:[Dragon/Effect] ATK:2500 DEF:2000 Level:7
          When this card is summoned:You can summon a "Blaster" monster from your deck and for the rest of the turn this card gains ATK equal to the monster summoned for this effect but this turn you cannot attack directly with this monster
          
          -During the Standby Phase: You can Fusion Summon 1 Light or Dragon Fusion Monster from your Extra Deck, by shuffling its materials from your field and/or banishing into the Deck.
          
          -When a card or effect is activated that would destroy a card(s) on the field (Quick Effect): You can Tribute this card; negate the activation, and if you do, return it to the bottom of the opponent's deck and During the End Phase you can Special Summon this card from your graveyard.

I have question about your upcoming Vrains story, is you Will put deletor and messiah  too? I remember they from link Joker too.

For the vrains oc since he's going to use star vader that means his link 3 could be blaster joker and his link 4 chaos breaker maybe you should watch vrains fanfiction like Yu-Gi-Oh! VRAINS: Hidden Memories By: scififan599 and Yu-Gi-Oh! VRAINS: Obscured Truth
          By: DivadX from fanfiction although the beginning of obscured truth is similar to that of hidden memories keep read since the second season of vrains divadx so a great job adding new things to the canon that didn't happen in the anime

Although I know that Shinobu is not interested in the fame of winning a tournament, I believe that he will be interested in winning when we enter the Friendship Cup since the opportunity to face Jack is very tempting for someone looking to test his strength and if he wins against Jack, I see Jack refusing to allow Shinobu to retire due to his pride since he will not allow the one who dethroned him to give up his title until he recovers it.