^ This came to mind when I thought of suicide units doing too much damage. Be sure to check the "Heart of the Swarm" tab and read the ability "Corruption"
In that game, it wasn't overpowered because its attack targets were limited to "aerial units." Essentially, limiting potential targets of their main attack reduces their potential by a lot. So my idea is to ditch the kamikaze role, but instead think up a ranged support unit:
Cost: 4 evos
Unit Role: Ranged support/Healer
HP: lowish-medium (100)
Movement speed: medium-slow (around the same as a walking goon)
Passive ability: A medical symbol (A red plus sign) is shown on top of your allies when they are at less than %30 of their maximum health.
Primary attack: A feeble and pathetic projectile attack. Huge increase in damage dealt VS structures.
Secondary attack: A projectile attack with 0 damage, but marks humans so they receive %120 of normal damage. If it hits a friendly alien, perhaps heals them for 25-50hp ? Should have a cooldown timer around the same length as a dragoon spine, perhaps longer.
This unit's primary projectile is excellent for dealing with a fortified human base: Just simply snipe their structures. This discourages camping, as opposing structures can all eventually be picked off, given enough time.
Use the secondary attack in order to help out during a fight by marking important targets, so the rest of your team can pick them off. In addition, use your projectile to heal wounded aliens
+Can easily destroy an undefended base, given enough time
+Can easily prevent the death of one or more allies
+Marking enemies can turn the tide of a battle if used correctly
-Can easily be mass-driven in 1-2 hits, as it is rather frail.
-Is essentially useless without an adequate force of goons/rants
-Is rather slow and also it has no "getaway" ability (ex. Rant charge, goon pounce)
-Is rather expensive
-High difficulty level required
Recap: Overall, not recommended for new players as it is both expensive and difficult to play well, as well as being situational. However, if it's used correctly, it can easily turn the game in favour of the aliens. If this were to be added, I recommend rebalancing the lgun and the flamer to make them actually usable.
Unit Stats Summary:
Movement Speed: Medium-Slow (Like a walking goon)
Primary attack damage: VS Players-
(To be announced later)