X, the local superhero who revealed a lot about their anatomy.
Alphablocks are a race of magical aliens from the planet Alphaland, of which they are the only inhabitants unless they spell a word relating to an animal. Comparing them to the one six-year-old human we see, the Alphablocks are approximately 3 feet tall, including the weird glass/plastic tanks on their heads. They are sapient blocks of an unknown substance, although X’s x-ray vision reveals them to have skeletal structures, and the same character talks about his muscles. When they hold hands and spell a word, they can do godlike things, although not all of them are pleasant, such as accidentally making themselves sick or releasing a bad smell in the air. When they met the Numberblocks, they were intrigued by all their differences. The entire species has only three voice actors.