Hmm, are you asking that since two of the most famous MOBA characters (Blitzcrank, Pudge) "hook up" with their opponents using their skillshots?
Well, we do have an already existing template: Link's grab pre-Ultimate (also, Young / Toon Link's), Samus' (both normal and ZSS) beam and Luigi's Poltergust. I'm sure I'm missing some tethers, but point stands.
I could see a hook-based character working, but it'd need to be very carefully balanced. The Links and Samus' grabs have been overall inconsistent - they're highly commital, and that's generally been dangerous for the Links and Samus since one missed grab can be punished. While Luigi's Poltergust is very low commital* and has very high reward. Namely, a Zero-to-Death (MockRock goes further into Poltergust
here when he criticized it). Luigi had the insane combos before Poltergust, but Poltergust added extra safety to it.
I honestly think a hook-wielding character (whether it comes from a MOBA or not) could benefit from having some utility with the hook itself, but not gain too much reward from it. Sure, we have Links' / Samus' tether recoveries, but there's more room for a hook or tether as a positioning tool on stage or as an approach option.
*(Honestly, that's what I personally dislike about it, since characters facing Luigi arguably benefit from retreating and taking damage to the point the Zero-to-Death no longer works. Of course, I'm talking skilled Luigis that can pull this off to begin with, but point still stands. I also dislike it because it's overcentralized to Luigi's playstyle. Adding just a couple extra frames of lag to Poltergust could help alliviate this.)