I went for Gau - I have one 5 star already so its now about collecting the cards, I already have S Aarav form that ride token thing, havnt really used him yet, still in the leveling up process, stuck between t2 and t3.
I have Daiyu - and I love her! She is great, she Lacerates Bleed damage, and if you come up against something real tankey, like a well build Aaron or something - you just put that 200% infection on him and ignore him.
I have a 5 star wangfa, and see that he could be real useful in roadmaps, fac assault, and SR, that hemo bleed is awesome!
Im just thinking with Sec Gau, well I have theory, that he would work well as an infection / burn team leader with his heal reduction lead skill, it can help Mateo and and The Trader keep there little infections on, and with his burn you could chuck Jobe in there, and have all sorts of carnage going on.