I like to think that Evenkite's influence on Fordite would quickly disappear as she loses herself in the fusion, but particularily being fused with Mars would do three things to her:

A) The aforementioned losing self in the fusion.

B) Being mixed with Mars, the only gem who has direct memory of their past selves, would awaken bits of Microcline in her.

C) The aforementioned losing self...After the fusion.

After the fusion comes apart, Eve would appear as a blank slate. She would not retain any memory of anything that happened prior unfusing and any semblance of her old personality would be completely gone. Instead, she would behave as Microcline would've, retaining their instincts/ticks and personality, but no memories or awareness that this was another gem. No memories of Microcline or Evenkite or any idea that she's acting differently or that this isn't herself. With time her memories and old self will steadily return and with it will fade any semblance of Microcline that wasn't original there, along with any memories formed during this 'Microcline phase', we'll call it.

Also, funny thing, Bloodstone will probably be the only one to recognize the behavior as Microcline's.

What if, if remained fused long enough, Eve would permanently lose herself?