What do Costa Ricans add to a word to make it mean something smaller?

Since Spanish uses gendered nouns, a Costa Rican man is a Tico, and a Costa Rican woman is a Tica. They often add this word as a suffix in order to create a diminutive or fondness. In other words, instead of saying "blanquito" (small, white), they might say "blanquitico" or "blanquititico", which means the same thing".

Explanation:

tica or tico  as in women and man so they would add a ca if its was a women and a co if it was a man to make the word masculine or feminine  

Explanation:

corras is the only one that is informal but doesn't follow the suffix rule. correr is the verb. corre is the formal verb form. corra would be used as the formal is corre ended with an a.

your best bet would be corras, it's the only one that is informal but is still wrong