Eiichiro Oda has introduced Devil Fruits in One Piece. If anyone eats these fruits, they gain a unique power-up. These Devil Fruits fall into one of three types. Depending on the type, a character would have a specific kind of ability. Among the hundreds of them introduced, the Riki Riki no Mi stands out.
The power of the Riki Riki no Mi is currently wielded by one of Blackbeard’s most prominent commanders, Jesus Burgess. It is a Paramecia-type Devil Fruit that allows the user to enhance their physical strength. Basically, it gives the user superhuman strength.
In Japanese, "Riki" (力) literally means “strength” or “power,” making the fruit’s abilities very on-brand with its name. It was obtained by him sometime after the events of Dressrosa, where he previously showcased no Devil Fruit powers.

The core ability of the Riki Riki no Mi in One Piece is sheer physical strength amplification. It doesn’t require a transformation, elemental manipulation, or any gimmick; it simply boosts the user’s muscles to monstrous proportions, allowing for feats like:
1) Lifting entire mountains and hurling them
2) Increasing punching power beyond what even Haki-enhanced fists can deliver
3) Becoming a near-unstoppable force in close-combat physical duels
Unlike other strength-based Devil Fruits like Urouge’s unnamed fruit, which requires the user to absorb damage to increase power, the Riki Riki no Mi grants instant or permanent strength augmentation. That makes it highly efficient in fast-paced battles.
What sets the Riki Riki no Mi apart is its no-conditions advantage. Unlike Urouge, it doesn’t require taking damage. It also doesn’t rely on creativity or strategy like Luffy’s or Law’s fruits. It’s a straightforward power booster, which in the right hands can be incredibly lethal.
What weaknesses does the Riki Riki no Mi have in One Piece?

As with all Devil Fruits, the Riki Riki no Mi in One Piece shares the normal weaknesses:
1) Water and Seastone can neutralize the user.
2) Haki-based attacks, especially if stronger, can bypass brute strength.
3) It's still unknown if the Riki Riki no Mi has an upper limit to the strength it can grant; this could become important in future battles.
That said, no unique or special weaknesses of this fruit have been revealed. Its simplicity is its greatest strength and possibly its greatest flaw too; it relies purely on overwhelming force, which may be ineffective against more strategic or technique-based opponents.
How powerful is Jesus Burgess with the Riki Riki no Mi?

Before even obtaining the Devil Fruit, Jesus Burgess in One Piece was already a beast. As Blackbeard’s First Ship Captain, he ranked among the highest in the crew’s hierarchy.
His reliance on brute strength, wrestling-style combat, and Haki already made him a dangerous opponent. However, his loss to Sabo in Dressrosa revealed his limits, especially when facing opponents with Devil Fruit powers and advanced combat techniques.
After gaining the power of this fruit, it seems like when it comes to brute strength, he would be unstoppable. When he was easily able to lift a mountain when the Blackbeard Pirates attacked the Heart Pirates, it was enough proof to support the fact that he is one of the strongest front-line fighters in One Piece.
If he were to combine his Devil Fruit powers with Haki, Burgess could easily become the most physically dominant character. This would add to the threat of the Blackbeard Pirates, as the crew already includes monsters like Shiryu of the Rain and Van Augur.
Final thoughts
In the final saga, Blackbeard’s commanders will likely receive serious spotlight and one-on-one battles with major Straw Hat members. Burgess, as the First Titanic Captain, holds a significant spot on the chessboard.
The final saga of One Piece promises explosive battles, emotional conclusions, and legacy-defining moments. Burgess and his mountain-crushing strength are sure to be part of that grand finale.