For people who want 10 Charisma in their party for whatever, I think this build is OK. It will do damage even on Supreme Jerk, choose between Energy Weapons or Rifles:
C - 6
L - 1
A - 3
S - 2
S - 5
I - 1
C - 10
8 AP, 10 CI.
If you choose Energy Weapons, then 1 point into Speed, else into Awareness - we want more CI.
If you want Rifles, put 2 points into Coordination for 9 AP for burst headshot.
I feel that Energy Weapons fit better though. You want Gamma Ray and 8 AP will allow to use it's x3 burst every turn with a not so shabby CI.
Gamma Ray will do ~150 damage on everything, more on late game enemies (damage is for highest difficulty). You don't need EW skill high to hit too.
G41 will do ~200 with a burst headshot, but CI will not be as high.
To grow in levels quicker and get at least something from that Charisma bonus, Computer Science is a skill with fat XP rewards. Heck, it's actually so fat I think any character with it grows quicker than others.
I really feel that Gamma Ray is the easiest to use. Since you don't care for crits, can use any trinket you want, like Three Snake Amulet, that gives +2 Ld, -3% crit, can get it in Arizona quickly. And you can keep EW skill low, while getting Leadership to 3+Amulet and one other skill.
To pump this into more competent, but glasscannon territory can use Choice trinket (+5 CI, -15% evade).
Here's level 37 char from my SJ playthrough with Choice ring & G41 rifle. He is 2-4 levels higher than others. I gave Gamma Ray to Rose. I just leveled up everything equally since it's not enough to have 5 Leadership to run with, say, Chisel; I chose Weaponsmithing since I wanted to try something else with Computers:
Here's character with Computer Science. I wanted something melee, and something special. So I made a Techno-Shaman, Bestia 2.0:
On SJ Dragon Claw does ~75 damage per hit. So full damage from this one is same as rifle burst, provided she uses all her AP.
The 10 INT allows to instantly grab 10 Brawling which is a must (or rather, 9 Brawling + Book from toaster in beginning). Brawler will only start doing good damage when you come by Rebar Knuckles. That's somewhere around Canyon of Titan. You will do ~40 dmg per hit.
Upon arriving to LA damage drops again, even with Boom Fist. Not to mention it's 4 AP per hit.
But upon finding Dragon Claws damage jumps again by ~50%.
The speed is not best but it is enough to run + land a hit and then some. Brawler's job is to sit in Ambush near shooter that is close to enemy (or just Wait), then when enemy rushes in (they always do, idiots), you hit 'em.
You can also hit robot and then hack him (that's what idea is about anyway).
From animals, you want a goat. It gives +1 Awareness.
And Strength? You don't need any. It doesn't improve damage in melee that much.
I probably even took a bit too much. But having even less HP per level seemed too eXtreme. Also should have placed 2 points into Speed, 1 Awareness, not 3 Awareness maybe.
Finally here's SJ completionist "blank state". PopeAmole called it "Scavenger". I call it "10 int + kill everything". Cause you can use this one to max any skills and it will kill anything too.
On highest difficulty pick Rifles.
On Ranger or lower Sniper Rifles also are good. But on SJ Anti-Materiel rifle headshot does about twice less damage than assault rifle headshot burst: