diff --git a/TODO.md b/TODO.md
index 53c8180..781ff9c 100644
--- a/TODO.md
+++ b/TODO.md
@@ -12,7 +12,7 @@
 - [x] Notes
 - [x] Synchronized arrows
 - [x] Slanted arrows
-- [ ] Different types of arrow tips (WIP)
+- [x] Different types of arrow tips
 - [ ] Fix column spacing with notes over multiple columns
 - [ ] Fix notes with arrows from start / to end / small arrows
 - [ ] Fix group size with self arrows + notes
diff --git a/gallery/example3.pdf b/gallery/example3.pdf
index 1bb20e6..b20dd93 100644
Binary files a/gallery/example3.pdf and b/gallery/example3.pdf differ
diff --git a/gallery/example3.typ b/gallery/example3.typ
index 65014ff..3cdce3a 100644
--- a/gallery/example3.typ
+++ b/gallery/example3.typ
@@ -65,11 +65,11 @@ chronos.diagram({
   _seq("a", "b", end-tip: "x", comment: `->x`)
   _seq("a", "b", start-tip: "x", comment: `x->`)
   _seq("a", "b", start-tip: "o", comment: `o->`)
-  _seq("a", "b", end-tip: "o", comment: `->o`)
-  _seq("a", "b", start-tip: "o", end-tip: "o", comment: `o->o`)
+  _seq("a", "b", end-tip: ("o", ">"), comment: `->o`)
+  _seq("a", "b", start-tip: "o", end-tip: ("o", ">"), comment: `o->o`)
   _seq("a", "b", start-tip: ">", end-tip: ">", comment: `<->`)
   _seq("a", "b", start-tip: ("o", ">"), end-tip: ("o", ">"), comment: `o<->o`)
-  _seq("a", "b", start-tip: ("x", ">"), end-tip: ("x", ">"), comment: `x<->x`)
+  _seq("a", "b", start-tip: "x", end-tip: "x", comment: `x<->x`)
   _seq("a", "b", end-tip: ("o", ">>"), comment: `->>o`)
   _seq("a", "b", end-tip: ("o", "\\"), comment: `-\o`)
   _seq("a", "b", end-tip: ("o", "\\\\"), comment: `-\\o`)
@@ -78,6 +78,34 @@ chronos.diagram({
   _seq("a", "b", start-tip: "x", end-tip: ("o", ">"), comment: `x->o`)
 }),
 
+chronos.diagram({
+  import chronos: *
+
+  _par("a", display-name: "Alice")
+  _par("b", display-name: "Bob")
+
+  _seq("b", "a", end-tip: ">", comment: `->`)
+  _seq("b", "a", end-tip: ">>", comment: `->>`)
+  _seq("b", "a", end-tip: "\\", comment: `-\`)
+  _seq("b", "a", end-tip: "\\\\", comment: `-\\`)
+  _seq("b", "a", end-tip: "/", comment: `-/`)
+  _seq("b", "a", end-tip: "//", comment: `-//`)
+  _seq("b", "a", end-tip: "x", comment: `->x`)
+  _seq("b", "a", start-tip: "x", comment: `x->`)
+  _seq("b", "a", start-tip: "o", comment: `o->`)
+  _seq("b", "a", end-tip: ("o", ">"), comment: `->o`)
+  _seq("b", "a", start-tip: "o", end-tip: ("o", ">"), comment: `o->o`)
+  _seq("b", "a", start-tip: ">", end-tip: ">", comment: `<->`)
+  _seq("b", "a", start-tip: ("o", ">"), end-tip: ("o", ">"), comment: `o<->o`)
+  _seq("b", "a", start-tip: "x", end-tip: "x", comment: `x<->x`)
+  _seq("b", "a", end-tip: ("o", ">>"), comment: `->>o`)
+  _seq("b", "a", end-tip: ("o", "\\"), comment: `-\o`)
+  _seq("b", "a", end-tip: ("o", "\\\\"), comment: `-\\o`)
+  _seq("b", "a", end-tip: ("o", "/"), comment: `-/o`)
+  _seq("b", "a", end-tip: ("o", "//"), comment: `-//o`)
+  _seq("b", "a", start-tip: "x", end-tip: ("o", ">"), comment: `x->o`)
+}),
+
 chronos.diagram({
   import chronos: *
 
@@ -93,11 +121,11 @@ chronos.diagram({
   _seq("a", "a", end-tip: "x", comment: `->x`)
   _seq("a", "a", start-tip: "x", comment: `x->`)
   _seq("a", "a", start-tip: "o", comment: `o->`)
-  _seq("a", "a", end-tip: "o", comment: `->o`)
-  _seq("a", "a", start-tip: "o", end-tip: "o", comment: `o->o`)
+  _seq("a", "a", end-tip: ("o", ">"), comment: `->o`)
+  _seq("a", "a", start-tip: "o", end-tip: ("o", ">"), comment: `o->o`)
   _seq("a", "a", start-tip: ">", end-tip: ">", comment: `<->`)
   _seq("a", "a", start-tip: ("o", ">"), end-tip: ("o", ">"), comment: `o<->o`)
-  _seq("a", "a", start-tip: ("x", ">"), end-tip: ("x", ">"), comment: `x<->x`)
+  _seq("a", "a", start-tip: "x", end-tip: "x", comment: `x<->x`)
   _seq("a", "a", end-tip: ("o", ">>"), comment: `->>o`)
   _seq("a", "a", end-tip: ("o", "\\"), comment: `-\o`)
   _seq("a", "a", end-tip: ("o", "\\\\"), comment: `-\\o`)
diff --git a/src/consts.typ b/src/consts.typ
index 4857aa7..ba99801 100644
--- a/src/consts.typ
+++ b/src/consts.typ
@@ -4,6 +4,8 @@
 #let LIFELINE-W = 10
 #let CREATE-OFFSET = 15
 #let DEFAULT-SLANT = 10
+#let CROSS-TIP-SIZE = 4
+#let CIRCLE-TIP-RADIUS = 3
 
 #let SYM-GAP = 5
 #let PAR-PAD = (5pt, 3pt)
diff --git a/src/sequence.typ b/src/sequence.typ
index 4866e41..0485d49 100644
--- a/src/sequence.typ
+++ b/src/sequence.typ
@@ -16,10 +16,34 @@
     "/": (symbol: ">", fill: color, harpoon: true),
     "//": (symbol: "straight", harpoon: true),
     "x": none,
-    "o": (symbol: "o"),
+    "o": none,
   ).at(sym)
 }
 
+#let reverse-arrow-mark(mark) = {
+  if type(mark) == array {
+    return mark.map(m => reverse-arrow-mark(m))
+  }
+  let mark2 = mark
+  if type(mark) == dictionary and mark.at("harpoon", default: false) {
+    let flipped = mark.at("flip", default: false)
+    mark2.insert("flip", not flipped)
+  }
+  return mark2
+}
+
+#let is-tip-of-type(type_, tip) = {
+  if type(tip) == str and tip == type_ {
+    return true
+  }
+  if type(tip) == array and tip.contains(type_) {
+    return true
+  }
+  return false
+}
+#let is-circle-tip = is-tip-of-type.with("o")
+#let is-cross-tip = is-tip-of-type.with("x")
+
 #let _seq(
   p1,
   p2,
@@ -175,6 +199,15 @@
     shapes += shps
   }
 
+  let flip-mark = end-info.i <= start-info.i
+  if elmt.flip {
+    flip-mark = not flip-mark
+  }
+  if flip-mark {
+    style.mark.end = reverse-arrow-mark(style.mark.end)
+  }
+
+  let pts
   if elmt.p1 == elmt.p2 {
     if elmt.flip {
       x1 = start-info.lx
@@ -197,12 +230,11 @@
       )
     }
 
-    shapes += draw.line(
+    pts = (
       (x1, start-info.y),
       (x-mid, start-info.y),
       (x-mid, end-info.y),
-      (x2, end-info.y),
-      ..style
+      (x2, end-info.y)
     )
 
   } else {
@@ -219,12 +251,58 @@
       )
     }
 
-    shapes += draw.line(
+    pts = (
       (x1, start-info.y),
-      (x2, end-info.y),
-      ..style
+      (x2, end-info.y)
     )
   }
+
+  // Start circle tip
+  if is-circle-tip(elmt.start-tip) {
+    shapes += draw.circle(pts.first(), radius: CIRCLE-TIP-RADIUS, stroke: elmt.color, fill: none, name: "_circle-start-tip")
+    pts.at(0) = "_circle-start-tip"
+  
+  // Start cross tip
+  } else if is-cross-tip(elmt.start-tip) {
+    let size = CROSS-TIP-SIZE
+    let cross-pt = (pts.first(), size * 2, pts.at(1))
+    shapes += draw.line(
+      (rel: (-size, -size), to: cross-pt),
+      (rel: (size, size), to: cross-pt),
+      stroke: elmt.color + 1.5pt
+    )
+    shapes += draw.line(
+      (rel: (-size, size), to: cross-pt),
+      (rel: (size, -size), to: cross-pt),
+      stroke: elmt.color + 1.5pt
+    )
+    pts.at(0) = cross-pt
+  }
+
+  // End circle tip
+  if is-circle-tip(elmt.end-tip) {
+    shapes += draw.circle(pts.last(), radius: 3, stroke: elmt.color, fill: none, name: "_circle-end-tip")
+    pts.at(pts.len() - 1) = "_circle-end-tip"
+  
+  // End cross tip
+  } else if is-cross-tip(elmt.end-tip) {
+    let size = CROSS-TIP-SIZE
+    let cross-pt = (pts.last(), size * 2, pts.at(pts.len() - 2))
+    shapes += draw.line(
+      (rel: (-size, -size), to: cross-pt),
+      (rel: (size, size), to: cross-pt),
+      stroke: elmt.color + 1.5pt
+    )
+    shapes += draw.line(
+      (rel: (-size, size), to: cross-pt),
+      (rel: (size, -size), to: cross-pt),
+      stroke: elmt.color + 1.5pt
+    )
+    pts.at(pts.len() - 1) = cross-pt
+  }
+
+  shapes += draw.line(..pts, ..style)
+
   if elmt.enable-dst {
     let dst-line = lifelines.at(i2)
     dst-line.lines.push(("enable", end-info.y, elmt.lifeline-style))