The following section (up until the dashed line) is purely theorycraft and technicalities - read it only if you actually feel like wasting some time. :-P
I've decided to format my post to clarify the combos I'm suggesting in a slightly odd way (you don't have to read the following indented text if you can just figure out my syntax by yourself):
(character)(special info)attack{target} > ...
Where 'character' and 'attack' are self-explanatory, and 'target' is one of the character's so-called 'partner's. That is to say that (Luigi)U-air{Luigi} is Luigi attacking Luigi's partner, and that (Luigi)U-air{DK} is Luigi attacking DK's partner. If the character is attacking his/her own partner, the 'partner' term can be dropped and be implied, as in (Luigi)U-air. Placeholders such as 'Foe1' and 'Foe2' or 'Opp1' and 'Opp2' are valid 'target's as well.
When there's a partner switch, I'll use an italicized switch in the middle of the combo (the switch is just suggestive that one may switch partners gracefully at that point in the combo, unless of course you wish to continue the gang-bang :-D).
Regarding the term 'special info', that's where things like specifying N-air's strong hitbox hits or D-tilt's hit trips etc., eg. (Luigi)(strong)N-air{Luigi} is self-explanatory.
Any combo designated "gang-****" or "Bros. Attack" or something to that extent at the beginning of the combo indicates that the implied partner for both team members is one and the same.
The reason why I sort of set this up instead of using the one in the opening post is so that if ever we (or 'I' if I'm the only one to ever use this format) come up with a character combo where the entire opposing team can be pummeled, the format can handle it.
Yet another set of pseudo-"Bros."
combo ideas:
(Luigi)(strong @ Low%, weak @ Moderate-High%)N-air{DK} > (DK)D-air > switch > (Luigi)*Anything, including FJP!*
A graceful and quick switch?
Bros. (Luigi)B-throw > (DK)(during the spin animation of Luigi's B-throw)PAUNCH!
this should give Luigi some extra cushion distance when compared to a D-tilt trip into punch combo
Bros. (DK)B/F-throw > (Luigi)(non-spike, low altitude, towards DK)B/F/D-air > (DK)U/D-Smash
Quite possibly a 'true' combo if done at low percents...
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Seeing as how the D.K. summary is up, and I feel like putting my word in about something new... I'm just going to produce a minor wall of text in favor of The Super Kirby Bros. :-)
Warning! What follows is
pure theorycraft with regards to team play - I've never actually played any serious team battles:
After playing as Kirby for a bit... I think he has the agility to keep up with Luigi both on the ground and in the air, and probably the defensive ability as well to cover up for Luigi's lacking.
Now, what Kirby can do: 0-50% combos, wall-of-pain even Meta Knight off-stage, and use long reaching aerials. Oh, and he has his range-licious F-smash (comes with a sprinkling of uber-priori-salt on top). Imagine that with Luigi mixed in - one F-air into another F-air, into another aerial into another aerial... It'd be like comboing with Mario almost.
Kirby can also behave as the defense of the team with his grabs and ranged ground attacks to give Luigi some breathing room (e.g. the duration of Kirby's U-throw should be sufficient time for Luigi to recover his faculties). The team can then go back on the offensive :-D.
I have no ideas on combos at the moment, however, so your eyes are spared of further walls-of-text. :-P
(( if Team Attack is on and Kirby gets Luigi's fireball at the beginning of the match, the team gains wall-of-ball capabilities :-D )).
EDIT: Darn - that last part wasn't even
half of a wall-of-text <_<