Answer:
I'm really blue but when you see me I'm red. You don't see me too often. I'm there for you if you're hurt.
What starts with an 'e' and ends with an 'e' but only has one letter?
I run cold and hot, I look blue but am red. What am I?
I am the same written forward backward and upside down.
I am the only thing that place today before yesterday. (one word)
Special abilities and brightly colored underwear are all you need to be one of these.