Stealth Moose
Umbrella Elite
Update: Having done some research, I can't seem to find anything official on Lu Bu's max stats or anyone else's, and there seems to be some variance among users, perhaps related to errors (counting in non-base stats), lack of proficiency (such as maxing a char with just growth points) and perhaps weapons equipped (whether or not that weapon is actually harmonious with the user).
Here's an example of people comparing stats elsewhere. Since I just got WO3 about a month or two ago and have been playing it a lot, this is new to me and very interesting. My top chars are Nemea, Da Ji, and Mitsuhide in that order, followed by Ma Chao, Achilles, Himiko, Nobunaga, Lu Meng, and Nuwa. Having played every character at least twice, it's hard to be even more specific, because there's a lot of diversity.
One of the posters in that link I provided says that Susano stomps, but that's not surprising given his Mystic badass position. When it comes to more human enemies, Honda is close and Lu Meng is surprisingly close as well.