I have like character tiers in terms of fun-level. At the bottom is junk like Kokoro, Sarah and Zack who I absolutely cannot stand playing as, in the middle is folk like Ayane and Lei Fang. Above them are the characters I really like, such as Rig and Tina. But all those those I only play sparingly. Then there's the elites, like Leon and Lisa, that I really enjoy playing as.
Lol that's a lot of tiers in the hierarchy. I'd just classify mine in just 3 categories: Comfort Zone (Forte), Neutral Zone (Has some knowledge) and Danger Zone (Little to no knowledge)
Not so much about knowledge. For example, I know Gen Fu pretty darn well. He's just also insanely boring to play. Meanwhile, I'm only moderately familiar with Christie, but she is still more fun to play as than Gen Fu.