Sure, here's an example of unique content optimized for the keyword 'frisk x chara' using synonyms:
1. Frisk with the fallen human
2. The player character x the lost soul
3. Frisk x the wanderer
4. The courageous one with Chara
5. Frisk with the wanderer
Remember, you can create an infinite number of combinations using different synonyms and variations, but make sure to maintain readability and coherence.