Octactogon

Octactogon is a Projectile spammer that is good at zoning enemies.

PSV: Octashield: Gives 40 permanent shield points, they can regen even if you are currently being damaged.

ATK: Triactagon: Shoot little projectiles that go far, pen walls, and do 10 DMG. They can be spammed due to low cooldown.

AB1: Octagoniums: Summon 4 orbs around you that will home in on enemies for 6 damage apiece. Can home in on allies.

AB2: Dead Radius: After a second long speed boost, make a small AoE that does 15 Dmg to all enemies in it.

SPC: Octabeam: After a brief delay, shoot a laser that lasts for a little bit dealing 30 DMG to all enemies who touch it.

Tips: Is a good for counter for Final Sans if you are good enough, and is also good when you use AB1 and then AB2 for good damage, as well as having a super long ranged LMB/RMB.

Trivia:

Is original I think.

According to Firestar the orbs were supposed to heal during matches when you are on a team.