Gekkaeko, the Titan Slayer

Heil kitty, the one who gassed the rats

*a fearful opponent is approaching*

Opera : EX meets Chrome : Devourer of ram

Turtolus, Wielder of Camoflage, Defender of his Homeland

Finnish deer, The soul eater

Cha'd, Surfing Guard of the Ice Plain

Goofy/ Yeeter of Toddlers

the holy crusade is usually friendly but in pirated copies, the holy music will stop and he will kill you. hp unlimited atk unlimted.

Vengeful Doodlebob, a Japanese demon. (+1% of damage for each drop of ink, can summon minions by drawing them)

Mystery attacker? (true form in comments)