last night, my pixel came! I flashed Graphene and I am now running it smoothly!

I am in the process of downloading apps and I have a question: I am interested in at least using discord on this device. It is absolutely one of my most used apps. On PC, I use legchord. Im a big fan. Is there something similar available for mobile? and I have a similar question for Whatsapp, and FB messenger (although those are less important)?