OK, added “Jean Grey”. I searched a bit and there were 2 other adopters of the “Marvel Girl” name: Valeria Richards and Rachel Summers, although I don’t know who was second then third user. And so far I think Jean Grey was still as “Marvel Girl” with this green uniform before her eventual “Phoenix” to “Dark Phoenix” to plain “Jean Grey” names.
Pretty sure the one on the left is Jean Grey
OK, added “Jean Grey”. I searched a bit and there were 2 other adopters of the “Marvel Girl” name: Valeria Richards and Rachel Summers, although I don’t know who was second then third user. And so far I think Jean Grey was still as “Marvel Girl” with this green uniform before her eventual “Phoenix” to “Dark Phoenix” to plain “Jean Grey” names.
spoiler🔞
Source: Marvel Heroes Complete Costume List - Jean Grey
Hm. I don’t read comics but I’m pretty sure I’m the cartoon they never refer to her as Marvel Girl. I did not know that was an alias for her.