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