Can you play as your gta online character in story mode?
Quick Answer
No, you cannot play your GTA Online character in Grand Theft Auto IV's story mode because GTA IV does not include an online mode.
Explanation
The provided evidence confirms that Grand Theft Auto IV is a 2008 action-adventure game focused solely on single-player gameplay. The game features Niko Bellic's story in Liberty City but does not include any online multiplayer component. GTA Online, the multiplayer mode allowing character customization and progression, was introduced later as part of Grand Theft Auto V (2013). Since the question references GTA Online and story mode, it appears to conflate two separate games: GTA IV (which lacks online features) and GTA V (which includes both story mode and GTA Online). Based on the evidence provided, GTA IV's story mode operates independently with pre-defined characters and no connection to online profiles.