Jinx is a walking weapon-platform and I immediately thought that a mechanical skin would fit her perfectly.
It's inspired by all sorts of sources.
Mecha Khazix, Bubblegum Chrisis, Evangelion, Ironman...
Her Bazooka "Fishbone" gave me some trouble, but I went for a Railgun with teeth.
Nami is originally a mermaid, but a dark version is always a good option from a design standpoint.
This time she's a sea witch, inspired by disney's "Little Mermaid" and some deep sea creatures or sea related elements.