The largest amount of energy is released from fusing two hydrogens into helium. The atom in the comic looks much heavier than hydrogen.

Also a chain fusion reaction is required for an explosion. The comic just shows non-explosive ionisation.

It looks like a heavy element so fusion would be net negative energy

Possibly but the common fusions are using isotopes of H, He, Li with some amount of neutrons, not naked protons.

Heavier elements as the big blob is releases a lot less energy, and the really heavy ones are not exothermic.