The jury's still out on this one.
I know a lot of people think Imu has multiple Devil Fruit powers, due to using Gunko's Arrow Fruit abilities during the Gorosei's fight with Sabo and Cobra. But, personally, I still think it's possible that Gunko could be "Imu's Assistant" who we've seen be in the Flower Garden with Imu a few different times. It could be that Gunko was in the shadow as Imu's bodyguard for the day or something like that. We just never saw Gunko because she was staying hidden.
Although, I get it. This is one of the only things we've seen Imu do in the story so far. And it would make for a interesting power set. It may even explain the Gorosei's powers.
But, personally, I think it would be more interesting if Imu's abilities lie more with "augmentation" or "modification" rather than straight-up granting abilities wholesale. For example, "upgrading" a regular "Spider" Devil Fruit into Saturn's "Gyuki" powers. "Supercharging" already existing Devil Fruits, basically. There's nothing to support that either, but I just think it'd make for a interesting twist.
And if Imu has one of the God Fruits, it would actually make sense for Imu to have some odd, reality-warping powers like the Nika Fruit has. Either being able to change other Devil Fruits, or basically having multiple Devil Fruit powers. Especially if Imu turns out to be the Forest God user, who seemingly created the Devil Fruits in the first place.
But, it's kind of too early to tell, either way.