俺様, オレ様, 己様, おれさま
Pronoun, pompous
1. I, me
2. self-centered man, egotistical man, pompous man
実験台ごときで恐れる俺様じゃないぞ。
は
Particle, pronounced わ in modern Japanese
1. indicates sentence topic
2. indicates contrast with another option (stated or unstated)
3. adds emphasis