Considering who is your digipartner is an interesting topic. This is a rather long post, so if you want, just skip to the end for the TL DR with my partners' evolution lines.
In my head it goes like this:
I'd be thrown into the digiworld and befriend a Candmon. He has a similar playful/trickster/jester personality type that I do, and at times he can be hot headed.
I'd have three other travel companions. Enoch would befriend a Crabmon, Anand finds a Hagurumon, and Harmony a Mushmon.
The digital world we fall into would be mostly hostile due to instability. There is a digital being similar to a human we initially encounter who informs us that the Four Pillars of the Digital World have become corrupted.
This world does not have digivices yet, so we cannot easily channel our inner power to evolve our companions. After weeks of journeying, battle experience combines with that inner power and:
CANDMON SHINKAAAAA ... WIZARMON!
CRABMON SHINKAAAAA ... EBIDRAMON!
HAGURUMON SHINKAAA ... GUARDROMON!
MUSHMON SHINKAAAAA ...
Since these forms were mostly earned through battle, they are near permanent.
In our travels after our partners achieve Adult forms, we come across a village that is being terrorized by a shadow at night. We find and fight the source ... SaberDramon! During the fierce battle, I realize that SaberDramon is not a bad digimon; the villagers stories are exaggerated, Saberdramon is merely defending himself. I call off everyone's attacks and befriend him.
This digimon represents more my cool, reserved, level headed, and sometimes darker, personality traits. Between Wizarmon and Saberdramon balance is achieved.
Wizardmon and Saberdramon make a fierce duo, combining magic, dark fire, and aerial assaults. However they are not always perfect friends, and sometimes bicker and compete for my attention.
Later, we happen upon an outcast Tyranomon. Weak in his resolve and afraid of conflict, he grows a backbone with the help of Anand. He stands up to the digimon that have been bullying him and joins our little group.
Tyranomon and Guardromon learn to cover each others weaknesses to become a staunch, unflinching team. Quick, explosive combinations of fire and metal take down the toughest foes.
Next is a Kiwimon that has lost his way and begins attacking the group. With Harmony's help, he gains back the purity of his heart. Combining Woodmon's thick bark with Kiwimon's sharp strikes, these digimon form a balance between attack, speed, and defense in battle.
Last to join us is Tortamon. He initially deceives the group, but Enoch helps to show him the error of his ways.
Tortamon's and Ebidramon's combined defenses are nearly unmatched at their level.
After many more tough battles and adventures, through SaberDramon's FRIENDSHIP Wizarmon learns to never give up HOPE.
Wizarmon shinka ... Piccolomon!
Saberdramon shinka ... Karatenmon!
Through an uncanny combination of sorcery and swordplay, the formidable duo is even more unbeatable. Our enemies are easily struck down when they attack in tandem!
Eventually, Guardromon learns to rely on Tyranomon's new found COURAGE and Tyranomon is engulfed by Guardromon's LIGHT.
Guardromon shinka ... Andromon!
Tyranomon shinka ... MasterTyranomon!
The case is the same with Kiwimon's LOVE and Woodmon's PURITY.
Woodmon shinka ... Pumpmon!
Kiwimon shinka ... Delumon!
For Ebidramon and Tortamon, it is the former's KNOWLEDGE and the latter's SINCERITY.
Ebidramon shinka ... Anomalocarimon!
Tortamon shinka ... Sagomon!
After traveling a while with our Perfect partners, the group splits to seek the Four Pillars individually.
By myself with my digimon I finally reach the Pillar of the White Tiger. The guardian is tough, but a miracle happens with Karatenmon and Piccolomon. They combine their powers of hope and friendship to jogress into their Ultimate Form.
They become ...
Easily slicing through their opponent, the corrupt pillar now crumbles and they must escape.
Enoch, Sagomon and Anomalocarimon arrive at the Pillar of the Black Tortoise. Through never giving up on themselves, knowledge and sincerity combine to form ...
Anand, Andromon and MasterTyranomon arrive at the Pillar of the Azure Dragon. Through Andromon's atomic light and MasterTyranomon's hot courage, they jogress to become ...
You can guess what also happens. Pumpmon and Delumon are facing the Guardian of the Pillar of the Vermilion Bird when they become...
With the pillars now destroyed, the digital world is thrown into chaos. The 4 humans and 8 digimon are brought back together by a mysterious force.
It turns out that their guardian and mentor, the one they first met upon entering the digiworld, is none other than the nefarious Dr @Phantasmos
He has been absorbing the energy caused by the deaths of all the digimon the party has defeated. Now, he activates this dark death energy and becomes ...
The 8, now 4, digmon tied by fate rejoin forces to clash against this nighmare.
The battle is fierce, and drags on with no end in sight. Eventually we use our combined strength to create and seal him behind the Wall of Fire. But the damage to the digital world has been done. As a last ditch effort, he corrupts our partners and turns them into the Dark Masters. The humans are nearly attacked and killed by the digimon we cared for and raised for so long, but using the last of his free will, Piemon casts a spell to teleport us to safety.
The humans find themselves back at Dr Phantasmos lab, where our journey began. They inform the Agents, who were Dr Phantasmos assistants, who are outraged and shocked that their master was trying to destroy the digital world.
Working closely with the Agents, specifically Gennai, we create the digivices, tags, and external crests to aid the next generation. It should not take them as long as it took us to reach Ultimate; they need to act quickly to restore balance to the digital world. It is difficult, but we find humans with whom to link the crests to. Within them, the crests' powers shine the brightest.
We also give up our crests to create these digimons in egg form:
From Hope, Seraphimon.
From Friendship, MetalGarurumon.
From Light, Ophanimon. (Or is HolyDramon actually canon? Who cares.)
From Courage, WarGreymon.
From Knowledge, HeraclesKabuterimon.
From Sincerity, Vikemon. (Though I think I prefer Plesiomon. Meh.)
From Love, Hououmon.
From Purity, Rosemon.
The crests are paired off to further aid attaining Ultimate. (Similar to how the crests of hope and light were used to become MetalGarurumon and WarGreymon. I think they should have done that for all the digimon.)
Gennai plans on journeying with and training the next generation, so for himself he creates the crest of kindness and a Wormmon.
Piemon eventually finds the lab and attacks, ruining most of the plan. During the attack, Gennai's data becomes corrupted and he forgets most of what he has engineered.
The humans escape back to our own world, which is comparably safer, using a portal that the Agents had been working on. However, since time is now unstable due to Apocalymon's influence, we arrive in the human world shorty after we left it, although we are now a few years older.
At least, this is an overview of a fanfic I've been too lazy to write which explains what happens to the original chosens briefly mentioned in the first season.
TL,DR: My partners are
Candmon -> Wizarmon -> Piccolomon
Saberdramon -> Karatenmon
Piccolomon + Karatenmon = Piemon
Thats how I got these scars.