3.17: Tia Callida letting Leo play with knives
4.3: An explosion in the sky
5.1: The Labyrinth is real and he's seen it.
6.3: He's met children of Zeus.
7.18: Pranking Coach Hedge by making his loudspeaker say things like, "The cow says moo."
7.24: Leo is a demigod?!
8.3: Meeting Festus in the woods
8.10: Fighting Clytius in the Labyrinth
8.16: Creating an instant party button for Bunker 9.
8.26: Esperanza Valdez dying in a fire at her workshop.
9.1: Finding a magic tool belt in Bunker 9.
9.15: Firing on New Rome from aboard the Argo II.
9.25: Hearing first-hand accounts of meeting Hercules.
10.18: Fighting Khione at the Wolf House.
11.26: Talking to Hephaestus (his father?!) through the god's old dream radio, and discussing Olympian history, wars, and vaguely, what's to come.
1.25: Kissing Calypso, after being stuck on Ogygia for an unknown amount of time and the raft to take him home finally appears.
1.29: Inspecting the Athena Parthenos for any signs of mechanical parts that might help it work and failing to find them.
2.4: Riding Arion across the Great Salt Lake with Hazel Levesque.
2.4: Meeting the dryads in Camp Half-Blood.
2.6: Starting the workshop fire that killed his mother under his own power.
2.10: Fighting the Skolopendra while sailing toward Rome.
3.3: Meeting Echo at the Great Salt Lake (and messing with her).
3.3: Hearing the Prophecy of Seven at his first bonfire at Camp Half-Blood.
3.25: Promising his mother that he wouldn't use his power again until he met his father.
4.28: Frank turning into an iguana to escape Chinese handcuffs.
4.28: Asking if control over fire is a Hephaestus thing and being told it isn't - or that it used to be, but it's extremely rare, and usually means something catastrophic will happen.
5.8: Aunt Rosa calling him diablo after his mother's death and refusing to take him in, instead sending him away with the police.
7.1: Meeting his half-siblings in the forge at Camp Half-Blood.
7.26: Hera altering Leo and Piper's memories.
9.26: Meeting Nemesis at the Great Salt Lake, who appears as Aunt Rosa.
10.21: Crash landing Festus and promising to reuse him later.
7.2: Blessing of Hephaestus, immunity to heat and fire
10.10: Blessing of Hephaestus, pyrokinesis
9.5: Technokinesis: understanding a how a machine works through touch, thereby allowing Leo to use without trouble
3.3: Camp Half-Blood t-shirt
4.11: Magic tool belt
THING
THING
THING
THING