Strats
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Stalker
Does: The stalker likes to sneak(duh).
Targets: Lone marines, Group Stragglers, base monkeys, pairs (for the daring)
First of all, you need to know how to stalk your target. I always parasite my marine before starting. This will alert your marine and even draw him from his group(if he has one). You'll know where you're target is and if you die it always benefit's the team, it also takes down his armor a notch and 1 less bite for you. Follow him and check the map to see where he is going(default button is "c"). You can go around and "intercept" or follow him. I would chuckle a bit one direction and move the other way to knock him, if you have cloak that is. USE THE WALL CLIMBING ABILITY, this is essential to following him, and sometimes you have no choice but to use it anyways.
If your prey fails to see you, sneak up and bite him in the ****, and he won't know what hit him. If your prey DOES see you, you can rush him by leaping at him and biting, or you can run, and the rine will be in defcon 4 mode.
For upgrades, I recommend silence, cloak, and carapace.
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The guerilla
Does: picks away at the rine groups
Targets: Stragglers, lead rines, base monkeys, pairs
Better get this out of the way:LEAP is your best friend. The speed boost and the extra dmg will always give a rine a hard time to aim. Before you attack, check out how many rines there are Basically, you should take a bite at a marine then run for it. Parasite is still good, because you get 1 less bite again. Focus really helps since you save energy, and more damage. You should NEVER target more then 1 marine at a time, or you will most certainly die. Isolate him, and leap bite him, then run. Wash, rinse, repeat.
For upgrades, I recommend celerity, focus, and carapace.
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The Kamikaze
Does: keeps enemy morale down, and weakens their groups.
Targets:Bases, Hive-lockdowns, Small and Big groups
Leap is still your friend. Anyhow, Xenocide is the favored weapon for this kinda work, so get sense of fear so you don't waste it. Track down groups and make sure they're packed together, otherwise your xeno will be a waste. Celerity will make you a harder target, and carapace will keep you alive longer. Activate your xeno right before you go in, and leap straight at the biggest pack, and you should get a few kills.
For upgrades, I recommend celerity, sense of fear, and carapace.
I'll add more strats later.
Updated.