How to Say "shy person" in Spanish
The Spanish word for “shy person” is “tímido” — B1 level.
English → SpanishB1
nounB1
referring to the individual

Examples
El tímido se quedó en una esquina durante toda la fiesta.
The shy one stayed in a corner throughout the entire party.
Los tímidos suelen ser muy buenos observadores.
Shy people are usually very good observers.
Adjective as Noun
In Spanish, you can often turn an adjective describing a person into a noun by adding the definite article (el, la, los, las). 'El tímido' means 'the shy person (male)'.
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