[lnels]

I've got a good one its called the devil devil fruit basically you become a devil of extreme power.

pros:
demonic powers
demonic forms (currently 2)
ability to create demonic weapons (also warships)
blood ability (give others demonic power)
control miner demons
extreme endurance and regeneration

cons:
can't swim
blood ability is a passive ability (in other words your blood can be stolen or forcible taken.)
blood ability creates versions whose strength and power depend on their spirit and heart.
time limit to demonic forms

if you want to know were I got the idea from do a google search on devil trigger.