Read this one recently. I think it's ok as a starter novel, like a Shield Hero, and swiftly becomes an "Overpowered character fantasy" series. I don't know if I'll continue with it as the first volume didn't quite hook me, but I figured I'd go over what the first one entailed.
I think a lot of people coming to this one are looking for 3 things: 1) A parent / teacher supportive relationship, 2) Cuteness (cat girl lead is very much in that Kanna from Kobayashi Maid mold, and a bit gap Moe with how she's ruthlessly badass when she fights despite her diminutive stature and quiet personality otherwise), 3) Fantasy action. It delivers on all of those aspects (the teacher / parent thing could maybe be a bit more expanded on with some further training + slice of life stuff).
Reincarnated as a Sword is a Reincarnation Isekai (reborn in another world) story where a man finds himself no longer a member of humanity... But a mentally conscious sword.
The story has a few arcs. The first is a decidedly lonely solo expedition by our sword hero, him quickly coming to terms with his newfound abilities to manipulate his metallic body through telekinesis and other aerial flight, and hack through monsters. The second sees him leaving the forest thanks to a chance run in with a cat beastman slave girl named Fran, who he helps free. There is then a preparation arc which takes up the majority of the novel, Fran going through the motions of joining the guild, buying new equipment, and finding lodging + foodstuffs. Nothing too interesting outside of some of the shopkeeper personalities, and even some of the character stuff you'd like to see there is done off-screen (Fran bonding with the guild's female receptionist is talked about but not seen). There's some obnoxious Fran fan service art which isn't even much in the text (the "teacher" sword is shopping with Fran for undergarments, and tells himself not to think anything perverse, which I guess the picture is supposed to represent his imaginings...uh). There is a guild initiation ritual thing in that arc which involves more battling too (and sizes up how powerful our heroes truly are). The final arc has our heroes participating in a guild request that involves most of the able bodied guild members, though we only really get to know one of the representatives (the overpowered Donadrond, who fights them in the aforementioned guild initiation).
The slave aspect is thrown out there, and then not really touched on much after Fran is free. I thought for sure they'd find additional contracts on the slaver, maybe go on a quest to save those folks from their constraints, but nope, Fran was his only living slave after a bear attacked the others from the caravan and there was apparently no operation base they could take out. It'd be nice to see the novel go back to taking out slavers and abolishing slavery at some point.
In terms of Reincarnation stories, this one is pretty tame since a sword, even a telepathically talking one, is not that unusual for a fantasy setting. I like the more unusual reborn as another being ones, from succubus to vending machines to spiders. The sword's prior life experience doesn't seem to be too much of a factor either, which is again, not unusual for these "Isekai" stories. Because the sword itself isn't that unusual, it becomes much more about the skill oddities it possesses, and the way they can be shared.
As for those skills, I think it's going for a different audience than, say, a Grimgar, where every single skill is given its moment to shine individually and has to be learned through training. Here, characters are just flinging newfound magic around like candy, and by the end of the book they have an insane amount of both useful and useless skills acquired that I could hardly even begin to list out. It feels in line with early Shield Hero in that way, though maybe Shield Hero had more focus on specific shields and skill combinations that made sense + got appropriate build up / explanation to their use.
I feel this is a good starter light novel. General tone is feel-good, no major stress. The characters are ok, and the frankness of Fran is kinda cute / funny but also leads to less developed interactions socially between characters (she likes to respond to long explanations with "'Kay"). The goal is pretty vague (evolve Fran for her race's pride; what does evolution entail and how do you know you've achieved it? Idk). There's no noble "become strong to save the world / defeat the demon lord" goal. There's very little character drama. It's very much an action packed series that will see our characters taking on guild quests to briskly rank up the boards to take on tougher quests. I know that the "dad" aspect of the sword character is an appeal, as is wanting to see the growth and protection of the young cat warrior Fran as well, and I think that'll get even more development later when there's less needed "set up" arcs. The bonus chapter for instance was more slice of life-ish, seeing them carving up monster parts and eating Hamburger monster meat.