As an elf, I warmly welcome Ninja being Str+Will, because elves need more Str and Will giving skills to bridge the gap between races. Considering catering is out and basically everyone can cap Dex+Int anyways (esp DKs with those 360 rolls, and giant pulls roughly 1200~ Str/Dex, 800~ Will and cap Int endgame with iced cafe mocha cater and trans, w/o any gear) basing it off of one or even both of those won't make the "elf master race" skill set "to out damage the overpowered giants" anyway.
It won't bridge the gap if the skillset is available to all three races, there will be a 242 stat gap between humans and elves. The only way the gap can be bridged is if they add more elf-only skills that give str/will, or if these skills or some future skills give more stats specifically to Elves compared to other races.
And people need to stop seeing this as Elf Vs Giant, see this as Elf Vs Human. Does the advantages of being an Elf instead of a Human really outweigh the massive amounts of disadvantages?
Never said that it's confirmed to be based off str/will, but the fact that it's likely, seeing the enchants and level-up bonus for Ninja.
Yea, for all we know they may change it to something like Dex+MP last minute, or it might be JUST Str for some skills and JUST Will for some other skills, not necessarily Str and Will for all the skills.