Stratovarius

Stratovarius is the Stand of Antero Kotipelto, featured in an unfinished part.

Appearance
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Personality
Stratovarius takes on a twisted version of Antero's brother Timo's personality, constantly encouraging Antero and directing him on what to do next. It also acts on its own to make his schizophrenic delusions real, either by physically interacting with the space around it or using its power.

Abilities
Stratovarius is referred to by Antero as "the most powerful Stand in all existence." As well as its overwhelming physical abilities, it also has the power to make Antero's ambitions, dreams, and delusions into reality.

Timeline Fusion
Stratovarius is able to combine the timeline/universe it's in with other ones, allowing it to do practically anything. While Antero can choose specific parts of the timeline that should be included or left out, he generally ends up bringing unintended side-effects into his timeline (such as every previous protagonist in the JoJo series), as is the consequence of this power. Antero cannot view the timelines beforehand, making every fusion a gamble as to whether it brings him more good than bad, or the opposite.