Hello young man and welcome to the site.... by all means buy yourself a baby peep they are a lot of fun and if loved and cared for even big roosters shouldn't get mean...
Glad you joined!
Not all roosters are mean... Study up on your breeds before getting one though. I have a big blue cochin rooster, he's the sweetest thing ever.... Then I have Neachy Peachy, a Buff Orpington rooster who is full of spit and vinager!