Todoroki Shoto from 'My Hero Academia' immediately comes to mind when thinking about characters who've mastered their ice abilities while overcoming their limitations. His Half-Cold Half-Hot quirk initially caused him physical strain and emotional turmoil due to his refusal to use his fire side.
Through intense training and personal growth, he learned to balance both powers, using fire to regulate his body temperature and prevent frostbite. The way he synergizes ice walls with strategic fire bursts in battles shows how he turned a potential weakness into a dynamic strength. His development from self-imposed limitations to full acceptance of his dual nature remains one of the most compelling arcs in the series.