Umika Hayami (Earth 7)

On Earth 7, the Lupinrangers never came to be because Zamigo never attacked anyone. Instead, Umika and her best friend, Shiho Ichinose, were attacked by a masked monster from The Diamond, but then they got saved by Kuroninja. Now, Umika fights by Kuroninja's side on Earth 7 as another Kuroninja.

If you were looking for Lupin Yellow, she's on Earth 1, not Earth 7.

History
Until the part where Ice Mask attacked, Umika's backstory is the same as Earth 1 Umika's backstory. Ayu Kuroda also knows Umika somehow, but the reason for that is unknown yet. Ice Mask attacked both Umika and Shiho, but then Kuroninja (known outside of Earth 7 as Kudoninja) saved them. Kuroninja noticed that Umika had some kind of hidden power within, so he trained her as his apprentice. Together, the two of them started fighting against The Diamond.

Later, during a fight against a masked monster, Umika discovered her hidden power when she held a crystal that turned orange and gave Umika a sudden boost of energy. She never fully learned about that power until she fought against Ayu Kuroda for the first time, who was using the Cyclone Dial Fighter to access the Mera L-Greedon battle suit.

Trivia

 * Umika is one of the few interdimensional counterparts to not be one of Kuroninja's counterparts.
 * Unlike Umika on Earth 1, this Umika is NOT in a romantic relationship with her universe's Kuroninja and doesn't even have romantic feelings for him at all.