1girl arm_behind_head arm_up armpits arona_(blue_archive) bad_id bad_twitter_id bikini black_bikini blue_archive blue_hair bow_hairband braid collarbone colored_inner_hair frilled_bikini frills hair_over_one_eye hairband halo looking_at_viewer multicolored_hair navel open_mouth outdoors pink_hair short_hair side_braid single_braid sitting smile solo stomach swimsuit two-tone_hair wariza white_hairband yokoshima_(euphoria)