In short it's a nice isekai story from what I have read so far. In depth: Main character's personality can best be described as, an elderly person walking through a zoo. MINOR SPOILERS.. Other characters, lets takes Elva as a representative (sibling) the most striking side character. We didn't learn why she was on a high horse, just that she was, she got her ass beat and we moved on. This was a missed opportunity for character development. Though how the main character doesn't care that the dad reveals his private information, it's nice in that you recognise that the dad exists only to talk about the main character and has no other personal matters to attend to or care about. Didn't explain how the dad has the position to call a king however I shouldn't fuss because it's implicitly tells you. World Background is something that you learn as the story progresses. But as of now 3/5 there hasn't been much care on for the dragons and lizards, THE MAIN CHARACTERS RACE. He just teleported into another realm with what felt like a "oh well here is another dimension that I can freely travel to," then we go back to the starting realm like nothing even happened. That was very out of place. Just some stuff I dislike are: -familiars pets or whatever . A slime goes "Meow," like what the hell. -the unrealistic fact that he got a slime girlfriend almost instantly after meeting her. Relationships shouldn't happen that fast. I honestly hope they breakup first and to have some emotional drama ' like real people' I don't care if they get back together or not. Maybe something interesting happens and he gets with the white dragon or maybe the white dragon gets jealous and kills the slime.
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LIKEAnother thing I'd like to mention is that the power progression of the main character is quick and that the 'training' is really looked over, he doesn't use his fighting style often but when he does I hope I see a speck of imperfection. In addition I hate familiars isn't he a shadow emperor? why does he need weak pets where weak things live to die, and two of them at that. I suppose he is unadjusted to the world or something I hope one of them dies so it teaches him a lesson. Get some character growth or something. Or just disappoint and resurrect with soul magic or some bs.