“Odd” (raro, extraño you may know. Oddly is the adverb.
Mortals sometimes behave “oddly” (de una manera extraña), and they also “dress oddly”.
There is also an expression, “oddly enough”, similar to “strangely enough”. Examine this sentence:
• Mr. Sanchez, oddly enough, forgot to mention higher taxes (…curiosamente se olvidio de mencionar…)
Someone who behaves oddly might be “an oddity”, and a thing can be an oddity (cosa rara, rareza). An example:
• Mr. Podemos is a bit of an oddity (…es un bicho raro).
So, I imagine that you have seen some oddities in your life and seen mortals behave oddly.