Kouchuugun Shikan, Boukensha ni Naru
Captain Corinth: The Galactic Navy Officer Becomes an Adventurer

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About Kingdom, Empire, Nation, Town, Dungeon in a Expansion/Defense story. Also Kingdom Building, Territory Management, Land Development.

Protagonist is reborn as a baby in fantasy/isekai
https://myanimelist.net/stacks/37356
Protagonist is a Servant, Royalty, or a Saintess/Saint in Fantasy/Isekai
https://myanimelist.net/stacks/48209
Protagonist's child is born/pregnancy during story (SPOILER WARNING)
https://myanimelist.net/stacks/37305

Lots of Creating, Building, Cultivating in Fantasy/Isekai
https://myanimelist.net/stacks/38431

Isekai-Fantasy/Dungeons dragged into the Modern World
https://myanimelist.net/stacks/38406

The story has a protagonist in a Polyamory with romantic development in Fantasy/Isekai. Includes 'Polygamy with romantic development', 'Multiple Lovers/Multiple Partners in an open romantic relationship', or an open romantic relationship with a harem. Also True Harem, Harem Ending, Harem-seeking, Hard-Working, Devoted, Couple Growth, First-time Intercourse, Marriage tag.

(PART 1) https://myanimelist.net/stacks/36913

Additional (currently no MyAnimeList page):
-(Manhwa) Trapped in a Hentai Game Academy / Trapped in the Academy's Eroge (currently 105 chapters)
-(Manhwa) Surviving in a Romance Fantasy Novel (Currently confirm)(Unless read WN)
-(Manhwa) The Main Heroines are Trying to Kill Me (Unless read WN)
-(Chinese Manhua) Yao Shen Ji / Tales of Demons and Gods (currently 478 chapters)
-(Light Novel) Bannousugiru Souzou Skill de Isekai wo Shitataka ni Ikiru! / Chronicles of a Creative Different World Reincarnation (completed v05)
-(Manga) Ii Gomibun da na, Ore ni Kureyo / What Good Social Status You Have. Give It to Me. (Unless read WN)
-(Manga) Isekai de Kuchizuke wo! Tensei Sekai wa Unmei no Hito de Michiteiru (Currently confirm)
-(Manga) Maou wo Taoshita Ore ni Matteita no wa, Sewazuki na Yome to no Ichaicha Renkin Seikatsu datta / After Defeating the Demon King, What Awaited Me Was a Lovey-Dovey Alchemical Life With a Caring Wife (currently 27 chapters)
-(Manga) Doryoku wa Ore wo Uragirenai / Hard Work Will Never Betray Me (Currently confirm)(Unless read LN)
-(Manga) Potion Kouji ni Sasensareta Ore Renkinjutsushi, Bishoujo ni Rachisare Ikoku de Itsunomanika Eiyuu ni naru / I, Who Was Demoted to a Potion Factory, Was Kidnapped by an Elf and Became an Alchemist in a Desert Country (Currently confirm)(Unless read WN)
-(Manga) Kiss kara Hajimaru Isekai Harem ~Ipputasai no Sekai ni Tensei shita node Kami ga Kimeta Unmei no Hito wo Sagashimasu~ (Currently confirm)
-(Manga) Millimos Saga: Battei Ouji no Tensei Senki (Currently confirm)(Unless read WN)
-(Manga) Game Sekai Tensei "Dunkatsu" / Reincarnated in the game world "Dungeon Activity" (Currently confirm)(Unless read WN)

Additional:
51-
52-
A 'Part 3' will be created if this list goes up to 60.

Since I've had trouble finding it myself, here's the collection of manga where the main character(s) have the advantage over the Sword and Sorcery world by flexing the most powerful magic of all: GUN.

Not saying they're all good, but I just want to collect as many in one place as I can.