oooh i liked it already i can see where it would go please when he got the summar beast let one of his abilities be sunshine and elements fire magma and ...... oh and since it's dxd harem i would like if you take grayfia yasaka kuroka serafall venelana ( change rias and sirzech mother to another women ) tsubaki raynare kalawner ravel ( engagement him with ravel and riser and rias like the story before issei come to rescue her .... ravel was intel and she helped issei too much but he made her a minor girl in his harem so he don't deserve her )
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LIKEoh there should be a lot of good abilities make him take other beasts abilities some would be sunshine snatch and [gate] (ainz spell ) and rinnegan abilities not rinnegan itself but that for the story also hmmm all the logia powers doflamingo's ito ito no mi whitebeard gura gura no mi ope ope no mi
power in the story sunshine snatch full counter infinity all logia devil fruits with gura gura no mi ito ito no mi and ope ope no mi (make Room field big can go as much as covering either underworld if he was there or earth or heavens ... zushi zushi no mi (gravity) ainz spells all slayer magic for all elements as an ability oh i think this is enough for now i would see for later
good abilities i wouldn't say it better ainz spells add devil fruits add slayer magic of all elements that mean gods dragons devils are weak against it add nanatsu no taizai bot only sunshine snatch full counter both phy and mag infinity there is also the demons commandements and curse demon mark assult mode all angel powers too from ark too graces and ........ it's should be one piece powers even haki is needed at highest level all marine six styles and secret styles and fruits power with awakening and all magic from fairy tail
don't forget rinnegan power