Here is an idea for a flying alien.
All values can be changed for balance.
Sprint key turns flying off, you can walk around, quiet and stealthy.
Sprint key turns it back on, and you fly and emit a loud buzzing noise.
Can slash people, advanced can grab people and move them around.
Battle-suits are immune to grab, and grabbed people can still turn.
However, this will allow you to drop people from heights or into deathtraps, or move them near your base or friends.
Take too long with it and he'll just shoot you down.
Speed yet to be determined, HP and damage yet to be determined.
I like this idea.
As for changes to humans:
1. short range med in a backpack like batpack--no bsuits
2. short range arm in a backpack like batpack--no bsuits, only allows reload, no weapon or armor buying
3. Replace the luci with grenade launcher/rpg/rocket launcher/bazooka--it would be extremely powerful, but not a base defense weapon, super long reload time, possibly no bsuit or no jetpack or both
The arm and med backpacks would help get the humans out of base, as they wouldnt have to return for health or ammo, but they would require groups to really be effective.
Replacing the luci would get rid of lucispam--no secondary fire(except possibly for grenade launcher for different fuses). Even more so than with the luci, someone with one of those would need to get out of base.