I have no idea if these combos are optimal or not, I haven't played much more than the rest of you. Still, this is the best source I've found for N+B and figured that since I was learning her anyways, I might as well make things easier for others who find the JP Wiki too dense to navigate.

Taken from http://npblasterz-wiki.net/nbfan/%E7%89%99%E9%87%8E%E5%8E%9F%E3%82%A8%E3%83%81%E3%82%AB

Ethica's move names are silly long, so know that:
Assault is Assault of the Dead
Screwing is Screwing of the Dead
Brandishing is Brandishing of the Dead
Stinger is Stinger of the Dead
Orgy is Orgy of the Dead
D2 is Dead of the Dead
D3 is Dead of the Deadx2 (Originally literally Dead of the Dead of the Dead)
D4 is Dead of the Deadx3 (Originally literally Dead of the Dead of the Dead of the Dead)

Legend:
hj - High Jump
(xxx) - Optional inclusion in the combo.
(x > x > x)x(n) - Repeat (x > x > x) n number of reps.
~ - Combo is lead into by various other combo parts, or leads into other combo parts.

No Gauge

(2A>)2B > 2C > 2E (>2E) or B Charge > Assault (The 2E can hit twice if spaced properly)

(2A>)2B(>5C) > 5E > C Charge

(2A>)2B > 2C > A Charge

(Near Corner) (2A>) 2B > 5E > 2D > JE > (Step)2A > 5B > JA > JB > JE > A or B Stinger

(Corner)(2A>) 2B > 5E > 2D > JE > Landing 6A > hjJB > JE > Crossunder B Stinger

5A or 2A or Close B or 2B or JC > Brandish or Screwing (I'm not sure if the JC here is a typo or not. It would make more sense as 5C, I haven't gotten JC to work)

6A > hjJB > JE > Landing hjJE×2 > Landing B Stinger

(Midscreen) Throw > Delayed 5D > B or C Charge > Assault

(Midscreen) Throw > Delayed 5D > 6A > JE Loop

(Near Corner) Throw > Delayed 2D > JE > Step > 2a > 5B > JA > JB > JE> A or B Stinger

(Corner)Throw > Delayed 2D > JE > 6A > hjJB > JE > Landing Crossunder B Stiger

Air Throw > 5D > JB > 6A > JE Loop

Uses Gauge

~ Charge(Or Assault) > D2 (>D3>D4)

~ Brandishing (or B/CStinger) > D2 (>D3>D4)

(2A>) 2B > 5C > B Charge > Orgy of the Dead

Charge or Brandishing B/C or C Stinger > Variable Rush

Uses Partner Blitz

B or C Brandishing > Partner Blitz > Short Dash > JE > Pursue

A Brandishing > Partner Blitz > C charge > Pursue

Screwing > Partner Blitz > Air Dash JE > Pursue

B or C Stinger > Partner Blitz > 5E or Charge > Pursue

~C Charge > Partner Blitz > 5E > Pursue

~2E > Partner Blitz > 5B(>5E ) > Pursue

Uses Combo Blast

Combo Blast > 6A > C Stinger > 5D > 6A > B Stinger > 5D > 6A > B Stinger > D2 (>D3>D4)

Combo Blast > (5E>2D>JE)xn > 6A > C Stinger > D2(>D3>D4)

Combo Blast > (JE>JD>JE)xn > 6A > C Stinger > D2(>D3>D4)

Combo Blast > (C Charge > 2D > JE)x2 > 6A > C Stinger > D2(>D3>D4)

Starting Parts

2B > Combo Blast > Step Close B > 6A > C Stinger ~

JA or JB or JC > Combo Blast > 6A > C Stinger ~

~2E > Combo Blast > 6A > C Stinger ~

Throw > Wait for last hit > Combo Blast > 6A > C Stinger ~

Air Throw > Combo Blast > 6A > C Stinger ~

~ Charge > Combo Blast > 6A > C Stinger ~

Screwing > Combo Blast > Landing 5E > C Charge ~

Screwing > Combo Blast > Air Dash > Landing 2A > Close B > C Stinger ~

~B or C Stinger > Combo Blast > Step > 6A > C Stinger

Brandish > (Quickly) Combo Blast > Slight Delayed C Charge > 2D > JE > Landing C Charge > 6A > C Stinger ~

~5E > C Charge > Combo Blast > Slight Delayed C Charge > 2D > JE > Landing C Charge > 6A > C Stinger ~

This section may be updated as I learn the character more. For now, have a video detailing how I've managed to more consistantly get her crossunder 623C to hit reliably. It was one of the more difficult things when I was figuring out her basics, so it might help some people.