ポイズンピンク

nami’s jinki is her compass!! she got it as a gift from bellemere (who saw he interests in exploring the world and despite it’s limited use in their current world of trash she still wanted to give it to her bc it felts important to nami) and it basically has 2 functions: first one the base of the compass explands kto form the layout of the terrain within a certain distance, allowing signals of living people within the area too (don’t get to know WHO just that there is someone), and two the compass needles grow bigger and have rope attached to sort of use as grappling hooks!!

her backstory is somewhat this (wip): similar to op, bellemere finds nojiko and nami the same way. she then proceeds to quit the hellguards to raise the two (bc she def ain’t putting em thru hellguard training lmao) . bc nami is able to draw maps in good detail and quick ,she sold them to people here and there and arlong (unaffiliated) found out about her skills and essentially put her to work from a young age to keep the maps for them updated (fish men would be the equivalent for someone who willingly lived in no man’s land places maybe) and bellemere gets killed by trynna stop em from taking nami away…

she initially joined the cleaners under the watchful eyes of arlong but properly escapes when luffy joins cleaners and defeats arlong and stuff