Sun Jian: Tends to be a decent if short lived character, they got quite a bit out of him in 7.
Sun Ce: The cocksure surfer dude personality can grate sometimes but also makes him a lot of fun, he had an impetuous energy about him. More subdued in 7 so loses that spark, despite the odd unconvincing flash of anger.
7 Wu story spoiler
Sun Quan: Always been mr Bland of Blandville. 7, got more of a sense of personality but he wasn't exactly Cao Cao in terms of intresting and awful voice acting.
SSX: Like Ce, her spirited personality aka the tomboy, has grated at times. Yet she has generally been my third favourite female and perhaps overtaken Zhen Ji to be second, maybe even first in recent times. That perhaps dampened the fire a little in recent times, partly for the romance, but arguably in a good way, she was my favourite Wu-ser in 7.