I usually find the character's moves that fit in certain criteria.
1. Crushes (Leifang 3P+K, Ayane 4P, Gen Fu 3P, etc.)
2. Spacing (Kokoro 214P, Ayane 3H+K, Mila 4H+K, etc.)
3. Good stun extension for each hit level (stuff like Kokoro 9P, Gen Fu 3P, Leifang 3P, everyone's P, etc.)
4. Any reset...