Several times I've seen teammates have multiple overlapping class avatars displayed in their team character slot. Two screenshots showing the phenomenon in two different matches are shown below. If you look closely, you should notice avatar overlaps in the second and fourth slots (from left) in both screenshots.

And a bonus compound screenshot showing the poor styling of the 'Insert Image' feature of the message board, as it appears normally on the top, and with hidden text highlighted on the bottom, shown below.