Digimon

Digimon is a series where children chosen from the Real World (the Digidestined) fall into the Digital World and, with the aid of their good Digimon partners, battle evil Digimon. A notable difference between Digimon and Pokemon is that Digimon can talk, and each Digidestined only has one destined partner.

Badfic authors often use the loophole that the children technically are all from the Real World, and so don't place the AU label on stories that have little to do with the canon story and often fail to include the Digimon.

Items
Each Digidestined possesses a Crest and Tag, which allow them to 'Digivolve' their Digimon from the Champion level to the Ultimate level (their Digimon normally spend their time as Rookie level, which is one below Champion). Each Crest represents a virtue (for instance, the main character, Tai, possesses the Crest of Courage, his rival/best friend, Matt, possesses the Crest of Friendship, etc.). Sues typically possess Crests that sound cool (Darkness, etc.) but do not fit the canonical pattern, or Crests that have powers beyond Digivolution (e.g. healing or flight).

Items
Digimentals are much like Crests-and-Tags, but a second-season Digidestined often possesses more than one of them. They are used to "Armor Digivolve" Digimon when normal Digivolution is blocked. Everything about Sues and Crests also applies here.

Characters
Daisuke "Davis" Motomiya, is often bashed by Sues, much like Ron Weasley. Admittedly, he isn't the brightest sort, but the Sues turn him into a cretin and refuse to acknowledge his good-heartedness. An alternative Suethor treatment is for him to become angsty and enraged at all his friends, much like Dark!Harrys. This appears to be a reaction against the bashing he often endures.