title says it all, i want to do a playthrough were Evil!courier plagues the Mojave. So i was thinking that i'd side with the powder gangers, and do an independence vegas. Probably do my best to corrupt/ruin every companions life, and all in all leave a path of doom and gloom across the area.

Any tips?

You can also just kill everyone. That ensures the worst ending for all.

join the legion, the evilest of them all!

Slaughter Goodsprings, Primm, Novac, Jacobstown, and the Mojave Outpost.

Kill Mother Pearl of the Boomers.

Leave the BoS around to raid.

Don't kill any Fiend leaders.

Help the Omertas take over the Strip.

Let the WGS degrade back to cannibals.

Have the Khans commit suicide.

the legion actually brings in all that order though, plus what sort of self centered evil [censored] works for a boss?

I was thinking i should also max speech fairly early in case any lying needs to be done

Wanna be really evil?
Get vilified with NCR.
Do Dead Money.
Don't argue or backlash Elijah.
Then by the end side with Elijah.
That oughta be evil enough.
Effectively killing Caesar, Lucius, Lanius, Vulpes, House and a lot of NCR too, hell if Kimball is there during the speech then bot he and Oliver are offed.
Could kill off three nations. It's highly speculative, but I think Legion with most of their leader figures dead would start to crumble, and NCR is already dying (in my perspective) so with the NCR being such a messup they'd fall apart due to revolutions and riots.
And House is in a fixed position, if the red mist doesn't kill him then Elijah will when he returns.

bleh, thats omnicidal, plus what kind of evil [censored] would want to work with elijah (or let him live after the bomb collar thing)

I don't want to go on slaughters through towns, i just want the worst ending slides. Like letting the strip get overrun by omertas, convincing freeside to riot, nuking every one in LR, convincing boone to be an assassin, that sort of thing. Oh well off to play [censored]!courier

Well you asked for the most evil thing, I'd say purging the Mojave is the most evil ending slider of them all.
As to the actual ending sliders of the Mojave?
No idea, I never created a "pure evil for teh evil" character so I can't help you there.

@Gabriel- in order to side with Elijah you must have negative rep with the NCR and I THINK positive with the Brotherhood.

@OP- I'd say either Independant Vegas choosing the chaotic choices, or Lanius becoming Caesar.

Kill House's robots in the Fort, at the end of the game destroy the Dam, work against the NCR in everyway possible, kill the Boomer's leadership, kill Caesar, kill the Kings, work with the Omertas and the white Gloves. If you truly have the blackness in your heart you'll know what to do

Well i've started [censored]!Courier (funny how that word is censored) So far i've sided with the powder gangers in goodsprings, which i've never done before. I guess i'm off to the prison next, see what quests they offer.