Thread:Manuel de la Fuente/@comment-25322628-20160707061134/@comment-5774380-20160708111839

I still contend that Eren's Titan form changes are attributable to aging. His Titan simply grew up like he did.

The Titan form can not be inheritable because then it makes no sense what Rod told Historia when he showed her the serum and said he had "chosen her a Titan form suitable to fight". Why bother to do that if she would lose it after eating Eren? That quote only makes sense if the form is NOT inheritable. Neither Frieda, Eren nor Ymir took another form after eating a shifter, they simply became more muscular which is also attributable to either growing, or training, or both.

The special abilities are likely not inheritable either because Eren was unable to harden until he swallowed Rod's bottle, and it's very unlikely that none of the Reiss Shifters (including First King) plus Grisha possessed the ability.

One can only speculate about what Zeke was meaning about "giving Reiner's armor to another warrior", but since the serum is made of spinal fluid, then maybe he was talking about extracting Reiner's spinal fluid with a syringe and use it as serum to inject to a normal person; then that person would gain Reiner's form in a mindless state and recover their human form after eating a shifter, but retaining the form and abilities given by the serum (Reiner's) and not those of whatever shifter they eat.