ideas for books

I had the idea of putting an mc with the grendel warframe in danmachi and even started to write about it(even if mc diden't even reach orario after reincarnating near it's entrence), but i kinda wanted something more VOID this time, i wanted the mc to be more of a ghost story in orario then a registered adventurer. I first thought of rell beeing the mc, but he would probably use the harrow warframe and harrow is boring as heck! Now, mc may or may not still be rell, but if he is then i would prefer him to use something like xaku or dagath, and maybe mc will just be an umbra warframe instead of having an operator. Between xaku and dagath i could make a nice ghost story with either, but dagath is just a ghost wile i could make xaku a ghost, speak in void tongue in the eldrich tone we see sometimes, maybe be invisible to gods(like cy say the reliquary drive is a color he have never seen, a direction they can't point to, an absence, etc)

Xaku's xata's wisper will most likely be unchanged, boosting weapon damage with void energy(but no bullet atractor. That would work weirdly in a non-game world). Grasp of lohk won't likely see much use as everyone in danmachi just go with melee weapons and shooting energy beams out of swords would look sily with grasp of lohk, that and the auto targeting and firering of those would probably be boring in danmachi, so maybe make it just an inventory ability? Just using it to store droped loot after a battle? Maybe disarming enemies every now and then? But certainly this ability will have to be nerfed into not dealing any damage. For xaku's 3rd ability, the void beam will need to not float enemies and instead be pure damage, the ability that makes enemies fight each other will need to be removed from his kit entirely, and lastly the ability that freezes an enemy and makes an area to debuff other enemies, i am torn on this one... maybe i could make it a speed debuff on one enemy and without the debuff area, the void tendrils would restrict the target's movement, but not freeze them in time and stop them from beeing harmed, my second idea is the exact oposite, freezing an ally in time and stopping them from coming to harm, maybe i could do both ideas? Perhaps, perhaps. For the vast untime ability i am boosting that evade chance to 100 percent and making it a passive that is always on, aka mc will be a ghost and all atacks will just pass through him as if he is a mirage, it won't make his other abilitys last forever tho, nor will he explode and damage things arround him, NOR HE WILL BE A SKELLETON!

I do not know what weapons mc will use, i thought about an incarnon one at first and innodem and felarx are beeing heavily considered, dorrclave is also a good contestent