Conversations is powerful xmpp client for android that supports OTR and GPG encryption and conferences (multi-user chats). It is available on F-Droid and other commercial app stores.
Here is what you need to do to get things rolling.
Get Conversations app from app store.
Add an avatar if you like or skip if you don't like it or already use avatar on another client.
All your contacts are synced between all the clients, so you can use disroot chat on all the devices at the same time.