You have an opportunity here to really get buck-wild with mech customization options, and you need to take it, ANET. People have already mentioned different colors/dyes, but please give us different bot body styles. It would be great if there were much smaller body options, perhaps that could float and not take up so much space all the time. Let us use them as mounts (with functionality based on the mounts that are unlocked). Give us bot emotes (watch tv, coffee maker, stuff like that).
Bots should also be able to help rez their gibbed engineers. Don't let rangers have the monopoly on that sweet sweet QoL honey. Those pansies wouldn't be anything without engineers and they know it. Scooping pet turds is the past. Mechs are the future. Take us there, ANET.