The characterization of Italy during World War II is more complex than labeling it simply as "mean" or "nice." Initially, Italy was led by Benito Mussolini, who aligned with Nazi Germany and was part of the Axis Powers. Italy participated in several aggressive military campaigns, which contributed to the war's devastation.
In 1943, the situation changed dramatically. Mussolini's regime was increasingly unpopular, and Italy faced military setbacks. In July 1943, the Allies invaded Sicily, and in September 1943, Mussolini was deposed and arrested. Shortly thereafter, Italy signed an armistice with the Allies on September 3, 1943.
Following the armistice, Italy officially switched sides, with some Italian forces fighting alongside the Allies against Germany. However, the country was also plunged into chaos, with German troops occupying much of Italy and Mussolini eventually being installed as the head of a puppet state in northern Italy.
So, while Italy did switch sides and sought to cooperate with the Allies in 1943, the broader context involves a complex and tumultuous political landscape, rather than a simple transition from being "mean" to "nice."