Your list is awesome, please keep it up, fellow comrade. It's so hard to find novels that have no romance that I've given up updating my lists. I hate having to start a novel, like it and then find romance in it, even after I try to search online to make sure it doesn't. I've fallen in this trap so many times. For example, 'the righteous players' I'm scared to even continue reading it, cause I know I'll drop it once I see any form of romance.

You should read/add "the heavenly demon can't live a normal life'. All he cares about is getting stronger. It's really soooooo good 

I would like to recommend "Apotheosis of a Demon" There are cute scenes, dark moments, family kinship and no romance. 

I love stories like #37 "Isekai Yururi Kikou" and #23 "Herscherik," but finding stories like these without the romance tag is a bit tricky. If you know any please let me know.

Your list is really awesome, tyvm for making it! You've definitely increased the size of my summer reading list haha.

 My rec for this is "Creating Heavenly Laws". It's got the Imperial Harem tag on NU but idk where that's from since I've read up to the latest chapter on qidian and there's 0 romance and it's not tagged there either. Everyone important in this world is more interested in getting stronk, as it's a sci-fi cultivation world where there's an active war going on. This novel is unique in that the MC rarely fights people in a life or death situation, it's mostly just his journey of getting stronger while inventing cool powers and staying low-key.

Hello, I loved your list and would like to make a recommendation as well . You should give "Return of the Mount Hua Sect" a try. It does not have any romance and the story is really interesting! The MC's personality is so unhinged, you just gotta love him . It is honestly  very well written. 

Our MC, after defeating the demon king and dying, wakes up in the body of a beggar into the far future. He finds out that his sect which used to be one of the ten great sects is now basically on the verge of extinction due the damages it suffered in the war with the demon king. MC makes it his goal to turn his sect back to its former glory. (The story sounds cliche honestly, but the way it is executed is anything but.)

The story has a comedic tone and our MC is incredibly strong and most of the time he is so ridiculous you cannot take him seriously but even despite all of that, MC's past trauma is not brushed off and that's something I really appreciate cause most of the time this is something that is totally overlooked in these types of stories. MC's relationship with his sect brothers, his sect elders as well as with other sect heads is absolutely gold! The relationships are just so well flashed out! Especially with the elders (the various sects heads) and MC. Since MC himself is an old (80 year old) grandpa stuck in the body of a young brat, he really gets along well with the other sect heads who are similar in age. Their personality is just as obnoxious as the MC. But there is not a single character who isn't left speechless due to the MC, proving he is definitely  the most obnoxious character of all XD 

This has both a novel (with good translation) and a manhwa adaptation (you can read the manhwa on webtoon, it's called "Return of the Blossoming Blade" there)! The manhwa adaptation is also really good!!! You can give both of them a try 

Issac has harem polygamy in the after story, no romance till the epilogue though..

Also not sure if there was concrete romance because heroines imposed themselves on Issac to marry them and then we have time skip about the their children as adult right after that