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That is what the upgrades are going to do, increase the power and reduce the cool down. Having that from the get go would skew his already stupidly strong growth.

the difference between 1000 and 5000 isn't significant however the difference between one million and 5 million is. It is a skill that will get stronger with time and the more prideful he gets the stronger the skill will become.

Not all of them are going to be in the Harem also alot of the Dxd girls aren't either.

All in good time the new 'Riser' is methodical in his plans, he will slowly but surely tear away the Satan's control over hell as well as the other two factions. The worst kind of evil is one that waits for you to make a mistake or misplay before tearing you to pieces...

Not as much, its not going to be extreme like +10 of each or anything like that.

It will only really happen once the third front opens up and the Mc has to use some real power to hold what he has gained, that power will bring eyes to the Russian wasteland. Spoilers below read at your own risk. , , , , , , , , , , , , , , , , Not all of the major powers care at the start as some will see it as a rebellion rather than a war but as you pointed out the Devils will as they know what the war is truly about due to Micheal. The Angels are yet to be informed as are the Fallen, The Greeks know but are not treating it seriously and two other Supernatural Factions know and preparing to get involved if needs be.

...Hope you enjoy the next few chapters then...

The reason he is reckless is a mixture of things, mental instability, over believing in his own power, knowing he is amongst the strongest in the town and much more. As to how he has survived this long when something is broken and survival is all it can achieve, they will do whatever is needed to make it happen.

I honestly can't say too much for spoiler reasons, the first arc will be mostly dedicated 0to the Oni issue as well as setting up his power base. What I will say is that these things are not mutually exclusive to one another, the next chapter will decide whether you drop it or not, if you do decide to drop it, then I apologise in advance that my story wasn't what you were looking for and I hope you do find one that is.

It's all good, it annoys me too.

I know but I'm limiting the power of the Mc (Also the members of the Harem), a lesser number will allow me to focus more on the characters I have without jamming in more of them.

The answer to that is an ability called 'Devour' which has only been mentioned in passing at the moment, a brief explanation has been given, it allows the user to 'steal' the abilities of those it is used on, making a mutagen out of them. There is now a large number of beings with Magic resistance ready to be eaten and used, giving him their equivalent power in exchange for more of his Humanity. He can slowly harvest Fallen angels, for example, gaining their strength and weaknesses before moving onto Devils or Angels, the name Apex Predator isn't just referring to his desire to dominate. It refers to how he will gain strength, eating his prey. As for Divine dividing and the like, there are things in place but spoilers will make it hard for me to say them. My only input will be Mutagens will contain up to mutate even after they have been maxed out and 'Evolution' is possible. The state he is in now isn't his final one, after all... “Stagnation is death. If you don’t change, you die. It’s that simple. It’s that scary.” — Leonard Sweet