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