Yes, you can change your Player Name and pick from an in-game Avatar option through the League.
To change your Player Name:
- Select the "Members" tab at the bottom of the screen
- Tap on yourself in the League roster (you will be the one highlighted with a purple background)
- Select the edit icon at the right-side of the red banner
- Input your desired player name or tap on the dice button for randomized suggestions
- Select "Confirm"
To change your Avatar:
- Select the "Members" tab at the bottom of the screen
- Tap on yourself in the League roster (you will be the one highlighted with a purple background)
- Tap on your current Avatar
- Scroll through the in-game Avatar options
- Once an Avatar is tapped, it will immediately be applied. If you want to make a different selection, repeat steps 3 and 4.