Mateo
Mateo is a tall, cool, beautiful, and clever male "humetarm" with "pale-orange" skin. Mateo can shoot purple plasma shots out of one of his arm cannons, but at a very fast rate of fire. Mateo's purple plasma shots are smaller than Eric's pink plasma shots. Unlike Eric's plasma shots, Mateo's plasma shots cannot travel through some things that would normally stop projectiles (some examples include solid platforms, or spikes) (without damaging some things that would normally stop projectiles (some examples include solid platforms, or spikes)), which stop Mateo's plasma shots and don't stop Eric's plasma shots. Mateo's plasma shots can still hit enemies, bosses, or wooden crates (whilst damaging enemies, bosses, or wooden crates), which stop Mateo's plasma shots. Mateo has low offense and mobility. Mateo is flightless.
After "Eric & Yannik 5" got updated to version 3.1.3.1, Mateo is stated to be father of the male "humetarm" Eric, the male "humetarm" Yannik, and the male "humetarm" Kabir. After "Eric & Yannik 5" got updated to version 3.1.3.2, It is also that Mateo created his children artifically, and that was created by a "hu-alien" that Mateo was named after. After "Eric & Yannik 5" got updated to version 3.2.0, it is also stated that Mateo created "Humetarm Heterodox Sikhism" ("Humetarm Heterodox Sikhism" is a sect of sikhism for "humetarms" that makes all sikh practices optional. The adherents of "Humetarm Heterodox Sikhism" are called "Humetarm Heterodox Sikhs" and "Humetarm Heterodox Sikhs" are not considered to be devout Sikhs.), "Humetarmistan", and the "only one can do it, the others have to stay" (prevents teamwork) policy, and that Mateo is the dictator of "Humetarmistan". After "Eric & Yannik 5" got updated to version 3.2.0 and before "Eric & Yannik 5" got updated to version 4.0.0, it is also stated that Mateo created the female "humetarm" Agga and is the father of the female "humetarm" Agga. After "Eric & Yannik 5" got updated to version 3.1.3.2 and before "Eric & Yannik 5" got updated to version 4.0.1.1, It is also stated that Mateo also created his children artifically and magically, and that Mateo was also created artifically and magically by a "hu-alien" that Mateo was named after. After "Eric & Yannik 5" got updated to version 4.0.1.1, It is stated that Mateo created his children using some pieces of metal from the forearms of the corpses of Mateo that Mateo left behind before reviving himself after Mateo killed himself and the liverwurst from the liver of the corpses of Mateo that Mateo left behind before reviving himself after Mateo killed himself, due to Mateo being lonely after Mateo created "Humetarmistan" after Mateo killed the "hu-alien" that created Mateo, and that Mateo was created with some pieces of metal and with the liverwurst made from the livers of the corpses of the other "hu-aliens" that were murdered by the "hu-alien" that created Mateo, and that the "hu-alien" that created Mateo also murdered Mateo with a corrosive gas chamber, but Mateo revived himself and Mateo killed the "hu-alien" that created Mateo.
In "Eric & Yannik X" and "Eric & Yannik 5" (before "Eric & Yannik 5" got updated to version 3.0.0.1), Mateo was a humanoid robot. After "Eric & Yannik 5" got updated to version 3.0.0.1, Mateo is now a "humetarm".
In "Eric & Yannik X" and "Eric & Yannik 5" (before "Eric & Yannik 5" got updated to version 2.0.0 and after "Eric & Yannik 5" got updated to version 3.0.0), Mateo has high defense.
In "Eric & Yannik 5" (after "Eric & Yannik 5" got updated to version 2.0.0 and before "Eric & Yannik 5" got updated to version 3.0.0), Mateo has average defense.
In "Eric & Yannik 5" (after "Eric & Yannik 5" got updated to version 3.0.0), Mateo can also shoot a purple EMP grenade out of one of his arm cannons, but he needs secondary fire ammo (which gradually regenerates on its own in "Eric & Yannik 5", no light-green stars required) to shoot said EMP grenade. Unlike almost all projectiles, and like Yannik's EMP grenades and MIRV EMP grenades, Mateo's EMP grenade is affected by gravity. Unlike almost all projectiles and unlike Yannik's EMP grenades and MIRV EMP grenades, Mateo's EMP grenades can stun enemies. In "Eric & Yannik 5" (after "Eric & Yannik 5" got updated to version 4.0.0), Mateo's purple plasma shots are stated to be "energy-elemental" and Mateo's purple EMP grenades are stated to be "electricity-elemental".
In "Eric & Yannik X" and "Eric & Yannik 5" (before "Eric & Yannik 5" got updated to version 3.0.0), Mateo can also shoot a purple laser out of one of his arm cannons that travels very fast, but he needs secondary fire ammo (which can be regenerated by collecting light-green stars in "Eric & Yannik X", and in "Eric & Yannik 5", secondary fire ammo gradually regenerates on its own, no light-green stars required) to shoot said laser.
In "Eric & Yannik 5" (after "Eric & Yannik 5" got updated to version 2.0.0), Mateo wears a purple bandana with white dots, goggles with white rims, and a purple polo neck with rolled up sleeves, bib-overalls with a purple belt with a white wrench, and boots, and Mateo has average defense, but unlike other playable characters, Mateo carries a purple ballistic shield in one of his hands that protects him from green slimes and small plasma shots. Mateo is also resistant to corrosions caused by green slimes and Mateo's secondary fire ammo regenerates faster. After "Eric & Yannik 5" got updated to version 2.0.0 and before "Eric & Yannik 5" got updated to version 4.0.2, Mateo has white forearms with white hands (Mateo's white forearms with white hands can turn into white arm cannons), Mateo's goggles had dark-blue lenses and dark-blue straps, Mateo's bib-overalls were dark-blue, and Mateo's boots were purple with white laces. After "Eric & Yannik 5" got updated to version 4.0.2, Mateo has "dark-grayish-purplish-blue" forearms with "dark-grayish-purplish-blue" hands (Mateo's "dark-grayish-purplish-blue" forearms with "dark-grayish-purplish-blue" hands can turn into "dark-grayish-purplish-blue" arm cannons), Mateo's goggles have purple lenses and "dark-grayish-purplish-blue" straps, Mateo's bib-overalls are "dark-grayish-purplish-blue", and Mateo's boots are "dark-grayish-purplish-blue" with purple laces.
In "Eric & Yannik X" and "Eric & Yannik 5" (before "Eric & Yannik 5" got updated to version 2.0.0), Mateo had purple hair and purple forearms with white hands (Mateo's purple forearms with white hands can turn into purple arm cannons), and Mateo is implied to have blue eyes, and Mateo wore goggles with blue lenses and blue straps and white rims, a purple sleeveless polo neck, purple pants with a blue belt, and purple shoes with white socks.