On my part Chimera is the buffer for my sanity against trying to maintain trait slot control over the tendency to go through elaborate loops to push random animal traits onto the purchase list and then explode us or fight another campaign to drop them...
Though since Water doesn't go into Chimera we can't accidentally make it inherent.
Shapeshifter is gated behind what now? And whats the difference in this version now that trait selection is intrinsic to monster/demimaking? Reasonably sure Mischief unlocks it...which also makes mortal guise mode redundant.
Shapeshifter is gated behind change. The right Moon, certain lesser duality aspect/spirits like life and death (with no inherents), and other naturally shifting creature aspects can push it up. Getting more than one Elemental Avatar helps, too. You are most of the way to unlocking it through mischief, and the
limited masking it gives you is what unlocks the 9 sustenance trait selector. With a more proper shapeshift ability that would be cheaper.
My levels of shape shifting:
Lesser Mask/Lesser Guise - The very bottom of the shapeshifting pool. Simple things like crossdressing, minor glamor-like tricks not unlike movie makeup, simple changes. It lets you 'mask' certain traits or otherwise make them more prevalent, which has a minor narrative effect when dealing with other spirits you could potentially befriend with or without X trait or physical descriptor.
Mortal Guise - Total trait suppression and total suppression of your spirit nature (allowing you to interact with other spirits or gods without the normal spirit-spirit rules of engagement, so long as the guise holds).
True Shapeshifting - The
actual trait, which gates things like selective body composition, partial shapeshifting, and
nearly equal trait selecting costs for breeding.
Protean Shapeshifting - What you guys actually want down the line for Gaer-thulu. The most advanced trait in the line that allows things like adaptive shifting in combat and spontaneous regeneration, assuming you have the sustenance to deal with the costs of shifting frequently in a fight.
Water avatar is a viable entry path to Protean and True Shapeshifting, though it's not been easy for you to kick onto the table thanks to the availability of OA's.