Luffa as a Super Saiyan 3 (超サイヤ人３ Sūpā Saiya-jin Surī*) to deal with a threat to the Earth, although she didn't have time to get dressed.
In case you don't know the differences, the Super Saiyan forms all multiply a saiyan's battle power (BP) by varying amounts, but can also taxing on their body.
Super Saiyan (超サイヤ人 Sūpā Saiya-jin) = 50x Base BP
~Second Grade (―第２段階 Dai Ni Dankai) = Strength and Speed of SSJ increases
~Third Grade (―第２段階 Dai San Dankai)= Strength of SSJ increases more than Second Grade, but speed greatly decreases
~2 (―２ ~Tsū*) = 2x SSJ BP/100x Base BP
~3 = 4x SS2 BP/400x Base BP
I don't know what the BP multiplier for Super Saiyan God is or Super Saiyan God Super Saiyan (or just Super Saiyan Blue, thank Kami for that).
So apparently, the SSJ3 form is going to be available in Xenoverse 2 for the player's custom saiyan character(s). So I know what I'm doing when I get the game.
Also, in case you're wondering...
Super Saiyan 4 (超サイヤ人４ Sūpā Saiya-jin Fō*) = 10x SS3/4000x Base BP
*Like how "超" (Chō meaning "Super/Ultra") is accompanied by "スーパー", "３" is accompanied by "スリー", "２" is accompanied by "ツー" and "４" is accompanied by "フォー".
Dragon Ball (c) Akira Toriyama, Namco Bandai