For me, Black Clover has some similarities. It features a fantasy world, magic, and characters on a challenging journey, much like Owari no Seraph and World Trigger. Also, the art style and action scenes might appeal to fans of the other two.
I think Tokyo Ghoul could be similar. It has elements of action, supernatural powers, and complex character development like those two.
I'd suggest checking out Attack on Titan. It shares intense action, a post-apocalyptic setting, and characters fighting for survival, which is comparable to the themes in Owari no Seraph and World Trigger. The plot twists and character arcs can also be quite engaging for fans of these mangas.
Chapter 174, ", Loyal Heir Academy", is the clearest early answer because it turns Gu Hang's situation into a concrete plot event. A useful checkpoint is the way the scene starts with After landing, Gu Hang's first important work meeting nearly... and follows through with Certainly, his arrival stirred some turmoil within the school, but....
Chapter 84, ", An Epic Victory", is the clearest early answer because it turns Gu Hang's situation into a concrete plot event. It opens with Bradford's initial answers did indeed leave Gu Hang unsatisfied, but... and closes on This was even higher than the profits from the previous ambush.... The key payoff is that the danger stops being abstract and the conflict around power growth becomes immediate, forcing the surrounding cast to react under pressure.
Chapter 157, ", Eve of the Star War", is the clearest early answer because the buildup finally cashes out in a real clash. A useful checkpoint is the way the scene starts with But isn't there a "Quintet" floating in the planet's orbit? and follows through with In at most an hour, that fleet would pass through the jump point and....
Chapter 161, "The Meaning of Life", is the clearest early answer because it turns Lacroix's situation into a concrete plot event. A useful checkpoint is the way the scene starts with They knew that it seemed like war had already broken out. and follows through with The fleet's supreme commander personally joining the fight was....
Chapter 58, ", indeed, one must not accept fate.", is the clearest early answer because it turns Wu Jiarong's situation into a concrete plot event. The chapter turns that into something concrete by moving from Was the power under Governor Gu Hang truly a technological wasteland? to The governor was coming soon, and she had no other choice; she....
Chapter 75, ", 3 Warnings", is the clearest early answer because the buildup finally cashes out in a real clash. Early on, Mondok knew what the right course of action was, he just didn't dare.... By the end, A large-caliber bullet, made of diamond, completely destroyed most of.... Inside the broader faction conflict storyline, the danger stops being abstract and the conflict around the main cast becomes immediate, forcing the surrounding cast to react under pressure.
Chapter 173, "Population, Production, Trade", is the clearest early answer because it turns Comprehensive Planning's situation into a concrete plot event. A useful checkpoint is the way the scene starts with Combined, these places had a population of over a million, which... and follows through with With two million people becoming hostile, the capillaries suffered....
Chapter 127, "Ideals and Unforgiveness", is the clearest early answer because it turns Governor's situation into a concrete plot event. A useful checkpoint is the way the scene starts with Gu Hang's speech ended amid the thunderous roar of "Long live the... and follows through with Even if he were to move on from this work area, he would have left a....
Chapter 141, ", Crumbles Upon Touch", is the clearest early answer because it turns Gu Hang's situation into a concrete plot event. The setup is The iron pipe rifles in the hands of those adventurers had no..., but the pressure keeps building through Even at that distance, where the person seen through the iron sights....
Chapter 73, ", why isn't anyone hitting him?", is the clearest early answer because it turns Gu Hang's situation into a concrete plot event. The chapter turns that into something concrete by moving from On the second day, at dawn, the sun had not yet risen, and the sky... to The moment for a final decision had come..