I haven't seen the older chapters... but I found something interesting... not sure if any of you readed the manga during this time...
So... we have a chance to see Hatchan/Hatchi again.Hatchan's Sea-Floor Stroll (はっちゃんの海底散歩 Hacchan no Kaitei Sanpo), ch. 182–228 (40 installments)
Hatchan escapes from prison and travels the ocean, meeting a mermaid named Camie and starfish named Pappug. He is spurned by Octopako, the object of his affections, but later finds fulfillment in running a takoyaki stand.
This was shown during the Alabasta Arc...