Sure is. Loki has been a significant part of Marvel Comics for a long time. He's known for his mischievous and sometimes villainous nature, but his character has had many layers and developments over the years.
The number of Marvel comic heroes is constantly changing and growing. As of now, there are well over 8000 characters, but new ones are always being introduced.
Loki in comic books is very powerful. He has mastery over magic, can shape-shift, and is often a scheming force to be reckoned with. His power level varies depending on the specific comic and plot, but he's no pushover.