HereAlice
hes pretty Weak for someone who has a Gacha system. Bro u said he may not get 2 devil fruit WHY ??. I mean with his system he can maybe get something like which can Cancel curses.
Current Luke's strength is can be said slightly weaker than Arlong and East Blue Luffy and his endurance is not the best but his speed alone surpassed everyone in east blue arc but this doesn't include his DF and Weapon. Level Cap System work like a rank for example if [Level 1 - 10] is F-Rank then [Level 11 - 20] is E-Rank. The reason why Luke growth is rather slow is because the East Blue doesn't have many dangerous pirates like the Grand Line do. The stronger the opponent is the easier for him to growth in strength. There is some future buff for Luke which you either expected or unexpected.
Tiuh_Gojo_Senpai:How strong is he compared to the people of one piece?, honestly i hate this system but not so much now but i think the system is limiting him too much instead of him growing in strength
Luke just needs a big crew of women to also act as protectors/mother's with them. He doesn't have to head to the grand line this second. Can have Desire eat the barrier devil fruit in this world and recruit her or have Nojiko joined as a sniper. Makino could also join them as a caretaker while learning to fight or something. I would recommend others like Mikita and Reiju but they're in Whiskey Peak and North Blue respectively. Since you've already gone down the rabbit hole with alternate reality just have the other two from the monster trio be girls in this timeline. Tbh, the truck god said he couldn't JOIN the straw hats, never said that group needed to exist in this world. Lucy, femZoro and femSanji can join his crew since he's already taking Ann away from joining the Whitebeard pirates. There's always a loophole that needs to be taken advantage of. You still gotta do the romance between Luke and Lucy/Makino. I am curious if you're sticking only to characters from one piece or will have a crossover character or two?