If you've read/watched the aforementioned, then you know EXACTLY what I'm looking for.

Re:Monster is very similar to slime,though edgier and the MC is pretty much an asshole and has good things practically falling on his lap occasionally.

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Finally, a reply, and a good one at that.

Mushoku Tensi is another japanese novel that is similar to the aforementioned novels above. Its about a loser that dies and somehow gets transported to another world that is filled with magic as a baby.

Ah, thanks. I've heard some good things about that one. I'll be sure to check it out. EDIT: Forgot to mention, but would you recommend that I read the manga or novel, or both?

I would recommend the novel. I tend to prefer the details and the novel is there so why not? Also as a basis I first read the original work before looking for any adaptations.

Would that be the web novel or the actual light novel that is getting released now?

I mean, just explore the isekai genre honestly. There are plenty of good ones, including ones where the mc is reincarnated as something other than a human, becomes op, is often heavily comedic (and action packed with a more serious tone every now and again), and basically all the traits those two bring to the table. Be it anime, manga, or light novel, the isekai genre is fairly infinite right now.