I'm more confused about Tanya's reaction. Considering, her backstory, personality and now military background- You'd expect her to just sort of shrug it off; after taking them back and maybe a swift kick to the balls. Kazuma probably ain't fast enough; to lead her on a chase anyways.

Theoretically, he could just take the lifespan of stray devils; malicious supernaturals or malicious humans in general if restricted to his own species. If he is willing to go down a darker road; he could create a philosopher's stone from full metal. Maybe, Leech evil souls from heaven's system? Alternatively, a snake from Ophis; would likely work just as well as a substitute for souls in the philosopher's stone.

I'd imagine that's one of those few things; that could get him erased from existence. Similarly, to cheesing the Skeleton Key. Though, Perhaps the cloak will allow him; to grasp at feats beyond mortal hands.

Honestly, at this point arresting him is stupid. They just don't have any way to contain him; or catch him for that matter... Chances are the justice league would just; drag their feet on that order- Anyways... Provided he doesn't cross a significant line. If anything... With the knowledge of his feats; and importance of his actions he should have diplomatic immunity at this point. You don't jail someone like that if they turn psycho anyways- You put them down... And let Death deal with him.

Plus, lifespan is the least of his problems lol. Far more likely one of the seasonal apocalypses gets him first. Can't really have lifespan while chilling out in Alduin's tummy after all. Anyways, I have a feeling Mephala won't let him go that easily- She's quite determined to get her boy toy. I mean she's essentially possessing a body; literally crafted with the expectation- That he'd it to relieve his pent up stress with that contract. At this point... I'm wondering if she's pent up; and trying to chip away at his paranoia.

Eh, not as weak as he thinks. He's probably a more versatile Akeno; at this point with potion buffs. He took on all four of them back to back- Despite being seriously injured in a surprise attack.

Sorta depends on whether his current abilities stack up to post Witcher 3 Geralt; and how much the awakening will buff him. Ciri never underwent the Witcher trials; so while magically potent as a source- She lacked the Psychical benefits they had. What he really should do before awakening tbh; is learn how to properly channel magic... At least well enough to add more Oomph to his signs; if not to pick up some sorcery tricks himself.

He really should have reported that bit of stupidity to Oranos. That Goddess did the equivalent; of pressing the big red doomsday button- Despite even her direct superior; telling her in writing that this is a stupid idea. I wouldn't be surprised if she was sent back to Genkai for this.

It's probably, just because he lacked a guardian. Apparently, he got to live alone because Kreacher was his caretaker. Either way, he's technically still financially independent. The only real inconvenience- Is the Weasley parents might try to "Parent" him... And he's probably going to need to avoid doing magic directly in front of them.

Didn't he kill Freed to save Asia? Or is this another timeline?

Eh, it just wouldn't be Gotham~ If you ain't getting mugged; at least twice a day. Nobody, in Gotham is simple. They might as well live in a war zone.

Huh, if Trigon gets the Joker treatment~ He's going to spend eternity knowing/watching his Nemesis is banging his daughter. So, every fathers worst fear... The day their daughter finally grows up.

So, who's the lucky guy that got the arrow to the Knee?

That looks more like a lobotomy.

I mean his Arcanum should be more than capable of healing her... He'd just have to cure her outside of the Danmachi world; so Gaia doesn't throw a fit. Idk, why he took so long to find a way; the solution should have been obvious.

... The pieces used were for the potential of a Longinus. Not Ddraig himself. Merely having an unawakened Longinus; in the form of twice critical- Cost Rias Gremory 8 pawns. Rias Gremory was a high class devil; with barely middling class power at the time. Understand, Issei at the time was a magically below average human; whose sole worth was a Longinus. This MC has the equivalent of a Longinus, The Shadow Monarch's skill, High Class Psychical Abilities and A System. If... Only if, Rias had a mutated queen could she theoretically turn him... Unless someone like Grayfia decides to do it with her own pieces; and give him out to Rias.

I doubt he can. Rias used 8 pawns on Issei; who had so little magic that he had to bike to his summonings. If a normal human with a Longinus; required that much from Rias- Potentially, only a mutated queen piece; allow Rias to take him as part of her peerage. Dude not only has a Longinus, and Shadow Monarch's skill... He's already stronger than them; with infinite potential if the system is taken into consideration by her pieces.

She could quite literally have just chilled out; in the vacuum of space. Sounds don't travel in a vacuum... And that's probably as effortless to her with teleportation; as it is overkill for what she wants. Even if we're talking about some; sort of mystical noise- I doubt she could sense it; with literal lightyears of distance between her and the source.

Heh, Mephala ever being the patient yet demanding temptress. He's in way too deep- for her to give up on him now.

Bal gets all butthurt because Mephala's champion shut him down; with a well planned betrayal. Like, that's literally her namesake- What did he expect? Did he really hedge all his bets; on the Mace of size compensation?