Underfell reminds me of 2p! Hetalia a lot. For some reason that explains it a lot. When you first meet monsters in underfell they are all mean (except flowey who is almost timid at first) which is close to be exactly opposite of the original undertale characters. Not exactly like a 2p! but close enough. The skelebros of UF used to be my favorite UF characters until I watched one UF Mettaton EX comic on YouTube, it was so sad! Since then UF Mettaton has been my favorite. He's awesome! (I greatly dislike UF napstablook and UF Alphys now ;-;) Regular Nabstablook and Alphys are great!