Ernst is a strange little girl that appears to be suffering from progeria.She has never demonstrated any use of any powers but it is hinted that she has super-strength during the camping with the special class.

No information could be found on Ernst's life before becoming a student in Charles Xavier's so-called Special Class that she attends nor could the nature of her genetic mutation be fully identified or understood. Ernst who appears to have befriended her disembodied fellow student Martha Johansson, briefly joined the so-called Brotherhood was founded by the mutant Xorn when he went on a drug-induced bieng controlled by Esmee on a destructive rampage lead by this fake Magneto in New York. though Ernst did not show any signs of aggression herself.

Ernst is one of the few mutants who have retained their powers after the events of "M-Day". She continues living at the Xavier Institute though she din't make to the New X-Men because she was excused by Emma Frost from the battle royale.