What is Robin's Devil Fruit?

Robin ate the Hana Hana no Mi (Flower-Flower Fruit) — a Paramecia-type fruit that allows her to replicate and sprout her body parts (primarily hands and arms, but also legs, eyes, and eventually entire bodies) from any surface within range. The blooming of arms from surfaces is depicted as flowers growing — hence the name.

How does she use it offensively?

Her signature attack is Clutch — sprouting hands from an opponent's back and bending their spine backward. She can deploy dozens of arms simultaneously, grapple multiple opponents, pin them, or snap limbs. She can also sprout her eyes anywhere for reconnaissance.

How does she use it for utility?

Wing-like arm clusters for limited flight, extra limbs for climbing or handling multiple tasks simultaneously, and reconnaissance through remote eyes. She's the crew's most practical ability for non-combat situations — she can grow ears in a room she's not in, see around corners, and handle physical tasks from a distance.

What is the awakening of her powers?

In the Wano arc, Robin achieves awakening: she can manifest an enormous giant replica of herself (Demonio Fleur) — a massive dark form with many arms capable of combat at a completely different scale from her normal fighting. This represents a major power leap.

What are her limitations?

She feels pain in any of her manifested limbs — damage to a sprouted arm is felt as injury. This limits how recklessly she can use her ability, though her strategic intelligence usually prevents situations where she needs to sacrifice limbs carelessly.