The prefix extro means outside or outward such as in extrovert.
Some words beginning with 'extro' are extroversion, extrovert, and extroverted.
Pelirojo Extro is Spanish. In English it means Extreme Redhead. !
The Latin words stem extro means garland outside in English. !
I can't find any prefix that means "can." "Eo-" means "dawn" or "early." soon!
The prefix for against is - anti, ant against, opposite antisocial, antiseptic,...