I like them all.
In terms of least, I'd say Mudkip.
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Out of the five listed in the poll (meaning not including second or final evolutions) probably Piplup or Oshawott. I've never liked Oshawott's design and probably never will (despite Samurott eventually breaking me down to love it). Also I really hate Ash's in the anime because it's an attention whore. I used to like Piplup. When D/P first came out I was like "OMG PENGUIN SO COOL" but after witnessing the horror of Dawn's Piplup I can't bring myself to like it anymore (though Empoleon is awesome).
Mudkip and Squirtle are cute, while Totodile is cool. So yeah, my least favourite is Oshawott or Piplup. Most probably Oshawott for a disgusting design.
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I really don't like Mudkip, I'm sure that meme was invented to annoy me, it just looks ugly and a simple leaf blade and its dead
Piplup. As many others have noted, mainly due to its anime counterpart. As a frog enthusiast, Froakie looks altogether promising. :p
Maybe Piplup. I dont like the design, its only a simple baby penguin...
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All the water starters are pretty cool actually, but there's always gonna be that one starter that just didn't appeal to you as much as the others. Once upon a time I would have picked Oshawott, but not anymore. I don't actually mind it anymore, in fact it grew on me and I picked it as my starter several times already and I have a notebook full of Oshawott doodles.
especially because of its evolutions, Dewott is so coolI'm sorry but I don't like Totodile much, though...I especially don't like Croconaw. Feraligatr is ok, though, plus it learns Ice Fang.
Oshawott, because the anime made me hate it.