Yes and No. Iroha tends to have a naturally strong voice that is not meant to have a cutesy softness to it that other female banks like Miku have. However to make Iroha have a softer voice one needs to use her character settings and also her dynamics. In the character settings bringing down brightness and downing clearness and downing gender (to be more effeminate) may help her have a "softer more cutesy voice". In addition using less dynamics in the editor itself may also help with this. Finally using filters in a DAW can help further to soften her voice but should be used cautiously as too many filters may computerize her voice too much.