>>9413985Thats Super saiyan 2, anon.. goku and Vegeta literally have the same aura and Goku is 100% a super saiyan 2. Toriyama clearly intended the lightning effect to be a super saiyan 2 thing. Especially in the co text you provided. Goku powers up to a super saiyan 2 so Vegeta powered up to the same form to match him.