The way you're concentrating on character development and growth better matches a proper novel writing style or long-running fanfiction over that of a web novel. This isn't necessarily a bad thing, but it risks reader emotional burnout when stretching things on for too long. It's one big reason a lot of webnovels skip over the emotional weight of isekai, either by ignoring it or timeskipping it. I'm liking the story so far, but try not trapping yourself in a corner with the character/emotional development.

Gaia is suffering huh? Is this standard human development Gaia suffering, or is this post-ORT 'Get it off! get it off! get it off!' headcrab recovery?

Glad GDI won the vote, though I wish I realized it was multiverse at the time to put forward United Earth Federation (UEF) from Supcom. Still way better than the MTL name either way.

Uhhh, might be worth switching it to "Psychic Technology"... I mean, I get the name, in context it makes sense but...

It'd be nice if this applied to vehicles as well; at least a discount with materials.

If you're taking the system from Red Alert, why not the name? Global Defense Initiative (GDI) kinda fits their needs in retaking the world, doesn't it?

Everything from this line down should be removed; it's a duplicate of the previous chapter.

Closer to a Phylactery - His entire soul is in the helmet rather than a fractured part of a soul. HP Horcruxes are bastardized phylacteries, splitting the soul like that.

Why though? Alchemists capable of magical homunculi creation are literally the one group of people who wouldn't have this issue... It doesn't even need its own mind. Really hope the original author didn't go down that path.

The word spacing on this chapter could use some work; It might be worth running the translations through Grammarly before posting. 47 suggested fixes, though it doesn't autocorrect "TheLegendaryMasterbrieflylistenedtotheloudsound" quite right.

Oh nice, I was sure MC wouldn't realize HSDK was included until after Erina was dragged in by Yami... Maybe that entire subplot can be averted!

Most of the suggestions have lacked an Antagonistic spark... Why not grab someone who is nominally a villain and see if they can become a hero? Ganondorf Dragmire

Not only did it feel artificial, but the backstory to it feels primed and ready to generate unpleasant issues. "His mother knew she was a devil and was trying to live among the mundane - what killed her so easily?" - With a 'lost bloodline' like the Sabnock, the Satans are liable to dig too deep and uncover the lies. If the MC is an Atavism born of an unknowing half-breed, it's a different story.... Unless you're actually planning on the MC getting caught in lies or the whole political bs-line plot, then sidestepping it is better than leaving it as a potential future plot hole.... Political plots aren't generally fun though.

The stacking of power systems and tropes is starting to feel a bit bloated. The way the whole "oooh, I'm a Sabnock nao" is introduced to Sera feels forcibly inserted to the chapter with the immediate denial and just doesn't feel believable with how the MC goes about it... It would probably be more believable if the MC said "I dunno where this came from, but look what I can do!" rather than what feels like a forced lie.

Gotta admit, moderately disappointed the AU didn't mess with the order/locations the slayers appeared. With how the story was going, I'd have preferred Gajeel or Wendy over Natsu.

RIP Goetia

It feels like the author is trying to bring the MC up to the level required to survive in other universes.

Yeah, a lot of others, but Authors usually avoid Naruto and One Piece because they can't really solve the issues in a month... well, not without nuking the villages and blowing up the Celestial Dragons.

Eh, shouldn't we assume the limitation is by rank? Even if the description doesn't mention it, I'd expect it to automatically fail on anything above SS rank - though that is admittedly fairly high.

Considering all the glove is supposed to do without Alchemy is create small sparks, shouldn't it technically always be useless unless the MC learns FMA Alchemy to match it?